Surface pro 4 charger wattage

Surface pro 4 charger wattage DEFAULT

Surface Go USB-C Charging: We tested 3 USB-C PD chargers for comparison

Can you charge the Surface Go with USB-C?

In short, yes you can. The USB-C 3.1 Gen 1 port on Microsoft Surface Go does support smart charging along with data transfer and video out capability. It supports USB Power Delivery revision 3.0 which supports 4 different power rules (5v, 9v, 15v, and 20v) with the ability to supply power up to over 45W.

Surface Go USB-C Specs

With that said, you will need a compatible USB-C with Power Delivery which rated at a higher wattage to fast charge your Surface Go. Fortunately, as we tested, the Surface Go can also be slow charged via standard USB charger as well. So, if you can’t find a USB-C PD charger, don’t panic, you can use any phone’s USB chargers or power bank to continue your work.

How to charge Surface Go with USB-C?

It’s really simple to charge your Surface with USB-C. Just like the Surface Connect connector, the USB-C connector itself is reversible, so you don’t have to worry about the wrong side plug-in. Anyway, there 2 ways to charge your Surface Go over USB-C depending on the available charger port:

  1. USB-A to USB-C: You can charge your Surface Go with any standard USB charger or portable power bank with a good charging rate (at least 5V/1.5A) by connecting them with the USB-A to USB-C cable.
    Charging Surface Go with Power Bank via USB-A to USB-C cable
  2. USB-C to USB-C: If you have a USB-C PD charger, which is highly recommended, and they are using USB-C port, then you can charge your Surface Go by connecting them with the USB-C to USB-C cable.
    Surface Go USB-C to USB-C Charging

Surface Go USB-C chargers we’ve tested

To find out what type of USB-C PD chargers work best for Microsoft Surface Go, we have tested three different chargers with USB-C PD support. To help you understand more about each charger’s specifications, we have put them together in the table below:

USB-C PD ChargersInterfaceMax WattagePower Rules
Google Pixel 2 chargerUSB-C to USB-C18W


Anker PowerPort Speed PD 30USB-C to USB-C30W




Pixel, Anker, and ZMI Charger

For better comparison, below is the specification of the original Surface Go charger and a standard phone charger that we’ve already tested:

Common ChargersInterfaceMax WattagePower Rules
Sony Standard Phone ChargerUSB-A to USB-C7.5W


Surface Go ChargerSurface Connect24W


Now we have an array of chargers with the power range from 7.5W up until 45W with different type charging interfaces. And now it’s time test it out, read on for the actual charging speed of those chargers.

Surface Go USB-C chargers testing result

The following table summarizes the speed, duration, and charging rate of each charger. We have ordered the chargers by maximum charging rate they can offer.

Note The following results are measured using a certain condition that is specified in the Experiment Condition section of this article.

Battery Level20%-80%
Total (20%-99%)
Sony Standard Phone Charger
Max 7.5W
4.0W - 3.6W
265 Minutes
3.59 - 3.43W
47 Minutes
3.42W - 2.37W
45 Minutes
4.0W - 2.37W
5 hours 57 Minutes
Google Pixel 2 charger
Max 18W
11.2W - 10.2W
90 Minutes
10W - 8W
16 Minutes
7.8W - 2.5W
31 Minutes
11.2W - 2.5W
2 hours 17 Minutes
Surface Go Charger
Max 24W
16.6W - 14.5W
60 Minutes
14W - 8.2W
15 Minutes
8W - 2.1W
33 Minutes
16.6W - 2.1W
1 hour 48 Minutes
Anker PowerPort Speed PD 30
Max 30W
18.0W - 16.4W
56 Minutes
13W - 9W
13 Minutes
8W - 2.6W
30 Minutes
17.3W - 2.6W
1 hour 39 Minutes
Max 45W
26.3W - 14.9W
46 Minutes
13W - 7W
16 Minutes
7W - 2W
37 Minutes
26.3W - 2W
1 hour 39 Minutes

What we’ve learned from the result

Now we’ve seen the result. Here are some facts that we can see:

  1. Battery below 80%: you can expect to get the peak charging rate of each charger.
  2. Battery between 80% – 90%: the charging rate starts to slow down to around 8W.
  3. Battery between 90% – 99%: the charging rate drop dramatically down to around 2.5W that takes twice as long as between 80%-90%.
  4. Battery between 99% – 100%: Our tested Surface Go took about 25 minutes to fully charge from 99% no matter what chargers we’ve tried.

Experiment Condition

Of course, the actual charging speed depends on your device’s settings and usage. It will be much faster to charge your device when it’s off, and it will be slow as you play games or use any heavy tasks.

Below are our testing condition that we used and think most people would use in the general situation:

  • Turn off the display: Never (Always-on display)
  • Display brightness: 50%
  • Auto brightness: No
  • Bluetooth: On
  • WiFi: On (connected to the internet)

Tracking Tools

Charging Speed Testing Tools

The tool we used to track the battery capacity, speed and duration of the charging is BatteryInfoView. Besides that, this tool also has the ability to display more detail information about your device’s battery.

We also use our favorite tool BatteryBar to view real-time charging stats right from the taskbar. You can download both tools for free from the links below:

Recommended Chargers for Surface Go

Since Surface Go is compatible with both the Surface Connect and the USB-C charging interface, you have many options when you want additional chargers to be used while on the go, at home, or at the office.

More powerful chargers for Surface Go

The following Surface Connect chargers are more powerful than the 24W original Surface Go charger. If you want a better charging speed, it's a good choice for you.

Microsoft Surface 65W Power Supply
1. Microsoft Surface 65W Power Supply

By Microsoft


Was: $79.99

See at Amazon

USB-C chargers with Power Delivery for Surface Go

The chargers here are relatively small in size, easy to carry around, and powerful enough to fast charge your Surface Go. Especially, since they're using USB-C interface, you can charge all your USB-C devices without carrying additional chargers.

Anker USB C Charger 30W with Power Delivery, PowerPort Speed PD 30 for MacBook Pro/Air (2018), iPad Pro (2018), iPhone XS/XS Max/XR/X/8/Plus, Nexus, LG G5, Pixel, MateBook, and More.
1. Anker USB C Charger 30W with Power Delivery, PowerPort Speed PD 30 for MacBook Pro/Air (2018), iPad Pro (2018), iPhone XS/XS Max/XR/X/8/Plus, Nexus, LG G5, Pixel, MateBook, and More.

See at Amazon

iClever 45W USB Type-C Wall Charger with Power Delivery Adapter for Nintendo Switch, Samsung Note 8, Pixel C, Nexus 5X/6P, Apple MacBook 2015/2016 and More[Contains a 6.6ft USB C to C Cable]
2. iClever 45W USB Type-C Wall Charger with Power Delivery Adapter for Nintendo Switch, Samsung Note 8, Pixel C, Nexus 5X/6P, Apple MacBook 2015/2016 and More[Contains a 6.6ft USB C to C Cable]

See at Amazon

ZMI 45W USB-C Wall Charger
3. ZMI 45W USB-C Wall Charger

See at Amazon

More Surface Go Resources

Make sure to check out our tips and tricks for Microsoft Surface Go here:

How to Enable Dolby Atmos Spatial Sound on Microsoft Surface Go

How to Enable Dolby Atmos Spatial Sound on Microsoft Surface Go

In this tutorial, we will walk you through how to install Dolby Access app and enable Dolby Atmos spatial sound on Microsoft Surface Go.

How To Boot Surface Go From A USB Drive

How To Boot Surface Go From A USB Drive

In this article, we will show you how to boot your Surface Go (1st Gen) and Surface Go 2 from a USB Drive in three different methods.

The 3 easy ways to adjust Surface Go screen brightness

The 3 easy ways to adjust Surface Go screen brightness

Are you getting stuck to lower, increase, turn up, brighten, or change screen brightness on your Surface Go? In this tutorial, we will show you the 3 easy ways to adjust screen brightness on your Surface Go.

Here’s how to disable secure boot on Microsoft Surface Go

Here’s how to disable secure boot on Microsoft Surface Go

In this article, you will find out how to disable Secure Boot on Microsoft Surface Go so you can install a different OS or do a clean Windows installation.

Ultimate Tips and Tricks for Mastering Microsoft Surface Go

Ultimate Tips and Tricks for Mastering Microsoft Surface Go

Get to know more about Microsoft Surface Go with our 20 Surface Go tips, tricks, and tutorials. It's very useful for beginner and advanced users who want to take full advantages and controls of their device.

How to enable Hibernation on Surface Go

How to enable Hibernation on Surface Go

In this tutorial, we will show how to enable Hibernation support on your Surface Go. It will allow you to put your Surface Go into hibernation mode right from the power menu.


[Updated 2021/09/22 with latest power supply info for Surface Pro 8 and Laptop Studio]

Some folks on Reddit and were interested in the various power supply options for Microsoft Surface products. Here is a list of power supply specs and product links for all generations of Surface tablets/laptops followed by a list of frequently asked questions.

Skip to the bottom for the FAQ

Surface Go, Pro, Book, and Laptop power supply specs and product links:

127 Watt PSU:

  • [email protected] (120 watts) + [email protected]
  • Model: 1932
  • Connectors: proprietary Surface Connector (12-pin) and USB A
  • Detachable IEC 7 AC/Mains power cable (1m long)
  • Originally shipped with:
    • Surface Book 3 15″ with NVIDIA
    • Surface Laptop Studio with NVIDIA RTX A2000
  • Notes:
    • Safe to use on other models but they won’t charge any faster
    • cable is 6″ longer than older power supply models
    • will not provide more than ~95 watts to Surface Book 2 or Book 3 13.5″
  • Amazon purchase link

102 Watt PSU:

  • [email protected] (95 watts) + [email protected]
  • Model: 1798
  • Connectors: proprietary Surface Connector (12-pin) and USB A
  • Detachable IEC 7 AC/Mains power cable (0.5m long)
  • Originally Shipped with:
    • Surface Book 1 with Performance Base
    • Surface Book 2 13.5″ with NVIDIA
    • Surface Book 2 15″ with NVIDIA
    • Surface Book 3 13.5″ with NVIDIA
    • Surface Laptop Studio with NVIDIA GeForce RTX 3050Ti
  • Notes:
    • Safe to use on other models but they won’t charge any faster
    • The cable and connector are ~25% thicker than those from less powerful chargers. [~7.5mm vs ~6mm for the connector and ~4.25mm vs ~3.5mm for the cable.]
  • MS retail store link
  • Amazon purchase link

65 Watt PSU:

44 Watt PSU:

  • [email protected] (~39 watts) + [email protected]
  • Model: 1800
  • Connectors: proprietary Surface Connector and USB A
  • Detachable IEC 7 AC/Mains power cable
  • Originally Shipped with:
    • Surface Pro 6
    • Surface Pro 2017 (except Core m3)
    • Surface Laptop
    • Surface Laptop 2
    • Surface Laptop Go
    • Surface Book 2 (Core i5 model)
  • Notes
    • Safe to use on other models
  • MS retail store link
  • Amazon purchase link

24 Watt PSU:

  • [email protected]
  • Model: 1735
  • Connectors: proprietary Surface Connector
  • Integrated right-angle flip-up 2-prong AC/Mains power for USA market
  • Originally Shipped with:
    • Surface Go 3
    • Surface Go 2
    • Surface Go
    • Surface Pro 2017 (Core m3 model)
    • Surface Pro 4 (Core m3 model)
  • Notes:
    • Safe to use on other models when the device is switched off but battery drain may continue if the device is switched on.
    • Some customers have reported intermittent charging on Pro 3, Pro 4, and Surface Book 1 devices that originally shipped with 36W power supplies
    • Often won’t charge Surface devices that shipped with 65W, 102W, or 127W power supplies although the white LED will turn on
    • Genuine OEM part not available from MS store – only available via warranty replacement or via 3rd-parties.
    • The inclusion of this smaller power supply is probably a cost-saving measure for cheaper devices. Using a 44W or larger power supply may charge some devices quicker.
  • Amazon purchase link

Surface Dock Power Supplies:

199 Watt PSU:

  • 15.35V @ 12.96 amps
  • Model: 1931
  • Connectors: “M12” barrel (7.4mm outer ring, 5mm inner ring, and 0.5mm center-pin)
  • Detachable IEC 7 AC/Mains power cable (1m long)
  • Originally shipped with:
  • Notes:
    • Up to 120 watts (15V @ 8 amps) power delivery to Surface Book 3 15″ devices only (95W, 60W, 39W, or 24W for other devices)
    • ~79 watts reserved for Dock power and USB ports:
      • 30 watts for 2 front USB-C downstream ports (5V @ 3A each)
      • 15 watts for 2 rear USB-C ports (5V @ 1.5A each)
      • 15 watts for 2 rear USB A ports (5V @ 1.5A each)
      • 19 watts for remaining dock operations (Ethernet, Audio, USB hub logic, DisplayPort MST hub logic, etc.)
    • Works with older 2nd gen Surface Dock
    • Same power connector is used on various HP workstation class laptops power bricks but they provide ~19V and are not suitable for Surface.
  • Alternate power supply info:

90 Watt PSU:

  • [email protected]
  • Model: 1749
  • Connectors: “M12” barrel (7.4mm outer ring, 5mm inner ring, and 0.5mm center-pin)
  • Detachable IEC 7 AC/Mains power cable (0.5m long)
  • Originally Shipped with:
    • 2nd-gen Surface Dock (brick style)
  • Notes
    • Genuine OEM part not available from MS store – only available via warranty replacement or via 3rd-parties
    • Some Dell power supplies will work
    • The Dock supplies ~60 watts to the Surface device with ~30 watts reserved for the dock electronics and USB port power.
      • 20 watts for 4 USB A downstream ports with 5W power delivery each
      • 10 watts for remaining Dock features (Ethernet, Audio, USB hub logic, DisplayPort MST logic, etc.)
    • Devices that shipped with the 102/127watt watt power supplies may experience battery drain while in use since the dock may not be able to supply enough power to keep the battery charged AND run the system at full load.
    • 3rd-party Optimum Orbis/KFD brand power supplies have a low-voltage cable that is ~8″ longer than the OEM cable and is a 3-prong class 1 power supply design so there is no “touch current”.
    • Works with Dock 2 but not when used with an NVIDIA-equipped Surface Book.
    • Same power connector is used on various HP workstation class laptops power bricks but they provide ~19V and are not suitable for Surface.
  • Amazon purchase link

Surface Studio power supply:

270 Watt PSU:

  • [email protected] + [email protected] ([email protected] standby power)
  • LiteOn Model: PA-3271-06MX P/N: X937405-008
  • Connectors: 8-pin internal Molex-style to mainboard
  • 3-prong IEC 320 C14 compatible AC/Mains receptacle 
  • Originally Shipped with:
    • Surface Studio 1
    • Surface Studio 2
  • Available via Aliexpress and ebay

Older Surface Power supplies

Most 12V and lower Surface power supplies have been discontinued by Microsoft but are still available from 3rd-party vendors.

48 Watt SP1/SP2/SP3 Dock PSU:

  • [email protected]
  • Model: 1627
  • Connectors: barrel connector (4.5mm outer ring, 3.0mm inner ring, 0.5mm central pin similar to some HP/Dell power supplies)
  • Detachable IEC 7 AC/Mains power cable
  • Originally Shipped with:
    • clamp style 1st-gen Surface Docking Stations for Surface Pro 1, Pro 2, and Pro 3
  • Notes:
    • Genuine OEM part not available from MS store – only available via warranty replacement or via 3rd-parties
    • The Dock supplies ~31 watts to the Surface device with ~17 watts reserved for the dock electronics and USB port power.
  • Amazon purchase link

48 Watt SP1/SP2 PSU:

  • [email protected] (~43 watts) + [email protected]
  • Model: 1512/1516
  • Connectors: proprietary 5-pin Surface connector and USB A
  • Detachable IEC 7 AC/Mains power cable
  • Originally Shipped with:
    • Surface Pro 1
    • Surface Pro 2
  • Notes:
    • Surface RT and Surface 2 will work OK but will not charge faster
    • Genuine OEM part no longer available from MS store – only available via warranty replacement or via 3rd-parties
  • Amazon purchase link

36 Watt SP3 PSU:

  • [email protected] (~31 watts) + [email protected]
  • Model: 1625
  • Connectors: proprietary Surface Connector and USB A
  • Detachable IEC 7 AC/Mains power cable
  • Originally Shipped with:
    • Surface Book 1 (Core i5 model)
    • Surface Pro 4 (except Core m3 model)
    • Surface Pro 3
  • Notes:
    • Genuine OEM part no longer available from MS store – only available via 3rd-parties
    • Surface Pro 4 and later devices are designed with 15V power in mind, but will work OK with 12V power supplies
  • Amazon purchase link for OEM style power supply
  • YGJ single cable compact style power supply

24 Watt Surface RT/Surface 2 PSU:

  • [email protected]
  • Model: 1536
  • Connectors: proprietary 5-pin Surface connector
  • Integrated right-angle flip-up 2-prong AC/Mains power for USA market
  • Originally Shipped with:
  • Notes:
    • Surface Pro 1/Pro 2 will work OK but may charge slowly
    • Genuine OEM part no longer available from MS store – only available via  3rd-parties
  • Amazon purchase link

13 Watt Surface 3 PSU:

  • [email protected]
  • Model 1623
  • Connectors: USB A
  • Integrated right-angle flip-up 2-prong AC/Mains power for USA market
  • Detachable USB A -> micro USB cable (right-angle)
  • Originally Shipped with:
  • Notes:
    • Genuine OEM part no longer available from MS store – only available via 3rd-parties.
    • Most generic micro-USB phone chargers will charge the Surface 3, but will do slow slowly at a maximum of 7.5 watts. Some chargers will refuse to work if the Surface 3 is switched on.
    • Surface 3 devices with broken micro-USB ports can still charge using the OEM Microsoft docking station which powers the Surface 3 via the mini-DisplayPort connection using the DockPort protocol. Unlike Pro docking stations, this model includes an internal power supply and separate IEC7 AC/Mains power cable.
  • Amazon purchase link


Fast Charging?

  • Surface Pro 7, Pro X, Laptop 3, and later devices support “Fast charging” when used with a 60W or higher power supply. Fast charging is only enabled under certain battery level and temperature conditions. See

Which USB type-C chargers work best with the Surface Book 2/Surface Go/Surface Pro 7, Surface Laptop 3 and Surface Pro X?

  • Any charger that is USB Power Delivery 2.x/3.x compliant and provides 60 watts or more will work best. A list of preferred USB-C chargers is available in a separate USB-C power supply post.
  • 5-18 watt phone/tablet chargers are not recommended and may only work for trickle charging overnight.

How can I connect my Surface to battery packs or chargers that don’t have a Surface connector?

  • Any battery pack or charger that outputs between 11V and 16V at >1.5 amps will work with Surface Pro 3 and later devices. Any higher voltage risks ruining the Surface device.
  • All-in-one battery-packs like LiZone and BatPower work well. But any battery pack or power supply with a barrel connector output can be made to work with a Surface-specific adapter cable. (Note that some older adapter cables will not work with Surface Pro 2017 and later devices due to tighter enforcement of the resistor value on the HPD pin, so make sure to read the reviews to ensure it will work with your device:
  • USB-C based chargers and battery packs can work with many Surface devices using a USB-C -> MS cable. See the USB-C power FAQ for more info.
  • When evaluating the overall capacity of a battery pack to understand how long it will keep your device running on the road, compare the watt-hour rating of the device vs the battery pack. Here is a list of Surface device watt-hour ratings. So if your battery pack lists 100 watt-hour capacity, it will be able to charge a Surface Pro 2017 device approximately 2 times over.
  • Portable battery packs which output 5V via USB can be made to work with Surface devices using a separate DC-DC voltage converter, but this approach is not recommended due to durability/reliability concerns.
  • USB type-C battery packs that conform to the USB power deliver 2.x/3.x standard will work with Book 2 models. Most readily available USB-C power banks only output 30-watts and will charge the Book 2 quite slowly. However a few are available that supply 60-watts or more.

Are car chargers available?

  • Yes, but instead of 3rd-party car chargers which may not perform well and may not have high quality power system filtering, I recommend using the original OEM AC/mains adapter and a universal automotive inverter. A benefit of this approach is that many other devices can use the inverter too. One drawback is that inverters tend to be bulky. Most automobiles will work fine with 100-300 watt inverters and the standard interior 12v jack.
  • When using off-brand car chargers via 12V, do NOT crank/start the engine while the Surface is connected. Once the engine is started, it is OK to connect the Surface. By following this process, you’ll minimize the risk of power spikes damaging the Surface.

Which power supplies are compatible with which devices? What about 12V vs 15V?

  • Power supplies using the proprietary 12-pin Microsoft Surface Connector intended for Surface Pro 3/4/2017/6/7/X, Surface Go, Surface Book 1/2,  and Surface Laptop 1/2/3 are all interchangeable.
  • All devices since Surface Pro 3 accept between 11V -> 16V on the proprietary charge port and intelligently limit the current drawn and delivered to the system. Some devices come with 12V power supplies, others come with 15V power supplies.
  • The Surface Book 2 with USB type-C accepts up to 20V via the USB power delivery 2.x/3.x standard.

Will a more powerful (higher wattage) power supply damage my device?

  • No, the Surface tablet device limits the power drawn from the power supply. If a 3rd-party power supply that outputs more than 16V on the Microsoft proprietary connector is used, then it is possible to damage the Surface device. Similarly an uncertified USB type-C charger outputting more than 22V may damage the Surface device.

Will a more powerful (higher wattage) power supply charge my device faster?

  • Some models that shipped with 24-watt or 36-watt power supplies may charge faster when used with 44-watt or larger chargers. But most devices already come close to hitting the battery’s thermal limit when charging so a more powerful supply will typically not accelerate charging. Be aware that charging Li-ion batteries faster, and under hotter conditions such as when a device is in use, generally lowers their overall lifespan due to thermal stresses.
  • When the device is in use and USB accessories are plugged in or the GPU is under heavy load, you may see an increase in charge speed with a more powerful power supply connected.

Will a less powerful supply work with my more powerful device?

  • Yes, but it may not perform the same as the OEM rated supply. When the device is switched off, low-power supplies will work OK to charge the battery at a slower rate than the OEM supply.  If the device is in use, the battery may continue to drain even when plugged in or simply remain at steady-state charge. In some cases, smaller power supplies will simply be ignored while the device is in use and will only charge the battery when the device is switched off.

Can I get a longer or shorter cable for my power supply? Can I swap the cable for US vs EU vs UK AC/Mains plugs?

  • Yes. You can swap out the mains/wall-plug cable for a longer “figure-8” aka IEC C7 cable like these. Or a right-angle model like this. Longer cables are not available for the side that plugs into the Surface tablet.
  • All Surface power supplies are universal and will accept 110-240 volts at 50-60Hz so you can freely swap out the AC/Mains IEC cable for a different cable to match your AC/Mains wall socket.
  • Most USB type-C power supplies have interchangeable cables. Replacement cables should be certified for power delivery and meet or exceed the wattage required like these.
  • To shorten the mains/wall-plug cable you can get a straight IEC C7 plug or a right-angle plug.
  • The YGJ brand power supply is a single cable design and may be more convenient for some users.

Is 90 watts from the OEM MS Dock 1 power supply enough to power the Surface Book with Performance Base or Surface Book 2 Core i7 models that ship with a 102-watt power supply?

  • Yes, but there is a catch. Only ~60 watts is supplied from the Dock to the Surface with the remaining power reserved for the Dock electronics and USB ports. 60-watts is sufficient for most use cases however the battery will charge slower than with the dedicated 102-watt supply. When in use, the battery may remain at steady-state charge or slowly discharge depending on the system load.
  • For gaming workloads, the battery may drain quick enough to affect performance after ~4 hours. Once the battery charge gets low enough, the GPU and CPU will be throttled to reduce power consumption and allow the battery to recover.

I heard that the Surface Book 2 15″ has battery drain issues. Can you explain?

  • Some gaming workloads stress the Intel Core i7 CPU and NVIDIA GPU on these systems at close to 100% peak load and 100% duty cycle. Under these conditions, the system uses slightly more power than what the 102-watt power brick delivers so the battery drains gradually over 5-12 hours. Once the battery reaches ~10%, the CPU/GPU performance is throttled limiting game performance. If you are a hardcore gamer who routinely games for 4+ hours straight, this is not the right laptop for you.
  • Battery drain is typically a non-issue for heavy creative workloads. Tools such as 3DS Max, Fusion 360, SolidWorks, Maya, Photoshop, After Effects, Premiere, ProTools, etc. come nowhere near 100% duty cycle except for non-interactive batch rendering loads. If you are performing non-interactive batch rendering all day under tight deadlines rather than interacting with the software via trackpad/dial/mouse/keyboard, this is not the right laptop for you.

Can I plug in a USB-type-C charger along with the MS charger to charge the Surface Book 2 faster?

  • No. You can physically plug in both, but the MS charger will always take precedence and the USB-C charger will be ignored.

Can I use my MS Dock without a power supply? Can the Surface power the Dock?

  • No. You need to use the dock’s power brick to use the dock.

Why are Microsoft OEM power supplies expensive?

  • There is certainly a high profit margin on accessories like power supplies. The Microsoft OEM power supplies do have some advanced features not typical in generic designs including the proprietary zero-insertion force Surface connector, output stage filtering optimized for the touch/pen digitizer, and an arc suppression feedback loop to ramp up the current delivery on initial connection. These features help performance and long-term durability and may not be present on 3rd-party designs.

My power supply cable frayed…

  • Cables don’t last forever. Some customers feel that Surface power supply cables are particularly fragile and end up fraying without much use. Other customers’ power supplies last 5+ years. To ensure a long-lasting power supply cable, do not wrap the cable too tightly around the power brick and don’t kink the cable. When placing the power brick in a backpack or luggage, it is best to place it inside its own Ziploc bag or sleeve to prevent the cables from snagging on anything.
  • Several open-source 3D-printed designs can be used to optimize the process of wrapping the cables around the brick.

I heard about a power supply recall from Microsoft…

My charger or tablet charge port stopped working…

  • Inspect the tablet charge port with a magnifying glass to see if any debris is lodged between the pins or if any pins are bent. Flush out the port with compressed air and/or carefully clean with an alcohol wipe. If the tablet still won’t charge, try an alternate power supply. Conversely, you can try using the supposedly broken power supply on another tablet to isolate the issue.

Can I sync data via the USB A port on the power brick?

  • No. The USB A port can only be used for charging, not data.

USB port on power brick does not work with my Smartphone

  • On many Surface power supplies, there is a built-in USB port that provides [email protected] Many low-power USB devices will charge OK with this port, however some customers have reported issues charging larger cell phones that are capable of quick-charging. Typical symptoms are the phone not charging at all, charging intermittently, or the LED on the power supply cable flashing indicating a fault. Swapping to a different USB charge cable may help but it is better to use a different charger for a large cellphone or plug the cellphone into the Surface.

My Surface 3 (non-Pro) power port died…

Surface 3 devices with broken micro-USB ports can still charge using the OEM Microsoft docking station which powers the Surface 3 via the mini-DisplayPort connection using the DockPort protocol. Unlike Pro docking stations, this model includes an internal power supply and separate IEC7 AC/Mains power cable.

Why do I sometimes feel a slight tingling or “zap” when my device is plugged into AC/mains?

Statement from Microsoft: 

What is touch current?

Touch current, or “tingle current,” may be detected by some device users when a minute, non-hazardous amount of residual electrical current passes through the user when touching a device. The sensation caused by touch current can range from a sensation of vibration, to a slight tingle or mild pinpricks.

Touch current may be detected when a device is plugged into wall (mains) power. Normally, electricity runs from the wall outlet, through the device, and back to the wall outlet in a short, closed-loop system. Touch current may be noticed if a tiny fraction of the electrical current passes through a user rather than returning to the wall outlet. Good device design and electrical safety hazard tests ensure that any touch current passing through a person is insignificant and non-hazardous.

Touch current does not occur when operating a device on battery power because the device’s power source (the battery) and its power system are contained completely inside the device.

Microsoft’s internal standards for touch current, which are stricter than the applicable regulatory standards, are designed to minimize the perception for touch current.

Additional notes:

  • This is typically a side effect of the EMI suppression capacitors in 2-prong (Class 2) switching power supply designs which effectively couple the input side of the power supply to the output side.
  • Reversing the AC/mains cable 180 degrees may reduce the effect but likely won’t eliminate it.
  • To meet UL and IEC 60950 safety regulations there is a 250 micro-amp leakage current limit so you’re not going to get electrocuted. Rest assured that the Surface OEM supplies meet the regulations but under certain conditions, some customers may notice this small leakage current. Similar symptoms can happen on Apple. Dell, HP, Lenovo, etc. on models that use similar power supply designs.
  • Switching power supply designs with three prongs (Class 1) typically don’t have this effect, but they tend to be bulkier. A generic 12 volt @ 3 amp power supply with a barrel-end and suitable F-to-F barrel adapter and barrel->Surface adapter cables will work. The Wacom 100W Wacom 100W ACK42714 USB-C power supply is also a good cnadidate.
  • More info on stackexchange.

Why do the 102-watt and 127-watt power supplies stop working when plugged into an airplane outlet?

  • Most aircraft outlets are limited to ~75 watts. Get a 65-watt charger instead. More details.


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There’s an issue that plagues technicians and consumers alike. When a Microsoft Surface Pro 4 suddenly no longer powers on. Sometimes this happens seemingly randomly, other times, immediately following a repair.

Parts of this puzzle have already been answered elsewhere on the internet. But what happens when its “neither of those”?

With no available schematics, it’s difficult to determine the fault. We had a few of these in the queue, so we decided to reverse engineer one. We’ve put together a list of the 3 most common failures to check for, in order of likelihood.

Schottky Diodes on the Surface Pro 4

1. A bad Schottky Diode

If you made it here from a search engine, you’ve probably already seen this failure 10 times over.

A diode is effectively a one-way valve. It allows power to travel in one direction, and blocks it from traveling in the other. Unfortunately, a diode also causes a drop in voltage as power passes through it (known as the “forward voltage”). This is generally not ideal or efficient, and the voltage that is lost results in heat dissipation. This effect worsens the more current the diode passes.

Diodes also have a rated maximum current. Exceeding that current (say by overloading or short circuiting) can result in failure. Diodes fail in one of two ways. Either the forward voltage increases substantially (sometimes infinitely), or the diode effectively turns into a wire, allowing current to flow in both directions.

A Schottky Diode is a slightly “better” diode. These are commonly found in all kinds of electronics. Schottky diodes have a lower forward voltage compared to their silicon counterparts, are available with higher current ratings, are more efficient, and as a result allow for higher switching speeds.


The Surface Pro 4 has an abundance of Schottky Diodes on the motherboard. In reality, any of them have the potential to fail. In most cases though, one of the diodes pictured here will fail. These diodes allow either the battery or the charger to power the device. The use of diodes means that whichever input is higher voltage will feed power to the unit, without feeding power backwards into the other input. For example, with the charger connected, the charger will power the unit, without feeding the battery and potentially over-charging it. Conversely if you leave the charger connected but not powered on, the charger won’t cause the battery to drain.

If you have a lower end Surface Pro 4, you may find that the “charger” diode is not populated. This is because the dedicated charging IC has enough capacity to charge the battery, while the battery simultaneously feeds power into the motherboard. In either case, a failure of the diodes will present with the following symptoms:

  • Battery: A failure of this diode will result in the device immediately turning off when the charger is disconnected. This won’t effect charging the battery, or the battery reporting its state to the operating system, but will prevent the device running from the battery. In the case of a lower end unit (without the “charger” diode), the device will not function at all.
  • Charger: A failure of this diode (on higher end devices that have it) will result in the unit running from the battery, but not the charger. This may mean the device says it is charging, but the percentage decreases as it gets used. Alternatively (depending on the mode of failure), the device may not charge at all.
  • Spare: Funnily enough, on all of the devices we have seen so far, Microsoft was kind enough to provide us with a spare Schottky Diode. On the boards we checked, both sides of this diode connect to ground, and as such, it does nothing at all. We aren’t quite sure what happened here. Either there are variations of the SP4 that have this diode in use, or the part was accidentally left in the pick and place queue and nobody noticed. In either case, it’s handy to know in the event of a single diode failure, there’s probably a spare waiting for you in the device.

Testing the Diodes

So if a diode is bad, how can we tell?

With the battery isolated (this is important) use a multimeter in forward voltage test mode (diode mode).
Measure across the diode leads. You should have no more than 0.250V forward voltage, and no less than 0.100V.
With the probes switched around, you should get a very high voltage (like 2.800V), or “OL“.

If you get close to 0.000 in both directions, your diode is shorted and needs to be replaced.
If you get a high reading or “OL” in both directions, your diode is blown and needs to be replaced. A burn or hole is also a pretty good indication.


To replace the defective diode(s), you may be able to use the “spare” that we have noted above.

If you don’t wish to do so, or if you have more than one defective diode, we also sell replacements in our store.

One of the fuses on the Surface Pro 4

2. A bad Fuse

If the Schottky Diodes are good, or you replaced them both and the device does not work as expected, the next thing to check is the “fuses”. There are actually a number of these on the board. So many that we can’t list them all. We’ve circled the most common “fuse” to cause no power.

There are 3 variations of these fuses we have seen. In most cases they are a 0 ohm resistor, either marked “0”, or “000”. We still call them fuses, but in reality, they are 0 ohm resistors, aka “links”, aka “jumpers”. Less commonly, Microsoft chose to populate these with actual fuses, typically marked P or L.

If you locate the fuse we have circled, whatever it looks like is likely going to be the same for all the others.

Testing the Fuses

If you’ve ever used continuity mode on your multimeter, you will be quick to grab it out and check for the “beep”, indicating a connection.
Before you do though, be warned that this method is NOT fool proof, and may lead to misdiagnosis.

While a lack of continuity would certainly indicate a “blown” fuse, a 0 ohm measurement or “beep” certainly does not indicate a working one. This actually applies for all kinds of devices, and we learned this the hard way on iPhone Backlight fuses many years ago.

To correctly test the fuse, you need to pass some current through it. Your multimeter uses a very small amount of current to test for continuity, and it isn’t enough. There is a common failure mode where the fuse will appear to have continuity, until you try to pass current through it.

To confirm operation of the fuse, we set our DCPS to 1V, and 0.05A (50mA) to 0.10A (100mA).
The voltage here really doesn’t matter, but its a good habit to use less than the circuit is designed for. This prevents damage to components should you accidentally slip and power the circuit.

  • With probes connected to the DCPS, we verify the current limit by touching the probes together. The “CC” (Constant Current) LED on your DCPS should illuminate.
  • Now, place your probes either side of the fuse. The DCPS “CC” LED should illuminate, and the voltage should drop down to 0V. If it does, you have confirmed your fuse can pass current.
  • If the “CC” LED does not illuminate, if it doesn’t stay illuminated, or if your voltage does not drop to 0, your fuse is not working properly.

To replace the fuse, you can use a 0 ohm resistor, an iPhone/iPad backlight filter/fuse, or even a piece of wire (although we would advise against it).


Where to from here?

If it’s not the Schottky Diodes, and it’s not the fuses, what’s next?

Unfortunately, this is where the availability of information on the internet ends. It would seem that without schematics, nobody has worked out (or documented) what causes no power if its neither of the aforementioned.

We had a few devices that fit this criteria, so we set to work reverse engineering them to find out why.

To begin with, we connected the device to a DCPS directly and prompted the SP4 to boot with the power button. We figured if there is a short somewhere, injecting power and looking for heat dissipation is a good way of finding it.
We got no response at all.


This is unusual. Without schematics, we don’t really know what is responsible for the power on sequence, what IC is responsible for what rails, if any of our rails are powering up upon prompt to boot etc.

We set our sights on the power button. The first step to powering on the device, is obviously here. We were expecting to find a regulated 1.8V, 3.3V, or Battery Voltage at the power button. This is because the power button either needs to start “HIGH” and get pulled “LOW” (power button GPIO has a pull-up resistor), or start “LOW” and get pulled “HIGH” (power button GPIO has a pull-down resistor).

Upon probing around, we find that we have none of the above. Instead, we have a curious 0.157V. That’s bizarre. We appear to have located an issue.

Now to find out whats causing it..


Luckily, we have multiple devices in our queue, some of which are now working. We quickly probe the power button on a working device and find that we have 3.3V. Now we need to find out where this 3.3V rail goes, where it comes from, and why we don’t have it on some devices.


We found a 3.3V regulator on the board, but unfortunately, its generating 3.3V no problem. There must be more than one. We started probing around and found our mysterious 0.157V in multiple locations, next to multiple IC’s.

3.3V Rail on the Surface Pro 4

3. The secret answer. A missing 3.3V rail.

IT8528VG Hole Marked

While investigating our missing 3.3V rail, and mapping out all of the locations we have a mysterious 0.157V, we noticed a suspicious mark on the IT8528VG.

Just next to this is a capacitor where we expect to find 3.3V, but instead have only 0.157V

We cleaned the IT8528VG to see if it was an impurity sitting on the surface. Nope. That’s a very, very small hole. Huh…


At this point, we were thinking this IC might be responsible for our 3.3V output. A hole, and subsequently internal damage, would certainly explain why the output is low. We removed the IT8528VG and tested again, expecting to have 0V. Our 3.3V is back!


It turns out, the 3.3V rail is actually incredibly low current. So much so that a short on the rail, or excessive current draw, doesn’t appear obvious when powering the device from a DCPS. We assume this rail is a reference for digital I/O. We still don’t know where it comes from, but we now know why it was low. Our IT8528VG has failed, and developed an internal short.

We just happened to have a donor device, so we promptly pulled the IT8528VG from it. Without a stencil, we had to manually reball the IC.

IT8528VG Reball 2IT8528VG Reball 3IT8528VG Reball 4

IT8528VG Reball Ready

With a replacement IT8528VG ready to go, we installed it and checked our 3.3V rail again.

Everything looks good. We have 3.3V in all the places we previously had 0.157V. This includes our power button.


We checked the device on the DPCS. Upon prompt to boot, we immediately see current draw that is consistent with CPU activity.

Time for a final test..


It works!

We looked at the other devices in our queue.

All of them had the same missing/low rail, but none of them had a hole in the IT8528VG.
Regardless, we removed the IT8528VG and sure enough, our 3.3V rail came back.


Since our discovery we ordered a bunch of replacement IT8528VG‘s.
You can now buy a replacement IT8528VG from our store.


Disclaimer: We can’t say for sure that your device will absolutely have one of the 3 failures mentioned. There are many events that can cause many parts to fail. This is just a list of the most common failures we have encountered.

We have however fixed all of the Microsoft Surface Pro 4 Tablets in our queue. We have also assisted in the diagnosis of other devices around the world suffering from the same issue. In almost all cases we have encountered so far, the failure has been one of these 3 things.

Tags: Advice, Australia, Battery, Charging, Information, Micro Soldering, Motherboard, No Boot, No Power, Repair, Tablet

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Charge Your Surface Pro with Type C

Earlier this year, I wrote about the long-awaited Surface USB-C adapter that finally added a versatile USB-C port to Microsoft’s Surface Pro and Surface Laptop computers. The adapter works as advertised, but it’s large, heavy, clumsy, and expensive. I outlined three ways that Microsoft could have designed a better cable, hoping that the company would listen.

Turns out, someone was listening to at least one of those suggestions because you can now purchase a cable that lets you directly connect a Surface Pro or Surface Laptop to a USB-C battery or wall adapter for charging. The J-Go Surface Connect to USB-C Charging cable costs $19.99 and is available to order now.

The cable is exactly as its name describes: one end of the six-foot cord has Microsoft’s proprietary Surface Connect adapter, while the other end is a standard USB-C plug. I tested the cable with both a Surface Pro and a Surface Laptop, and I was able to charge both devices using either a USB-C PD battery pack or a USB-C wall charger.

J-Go rates the cable at 15V and says it will work with most USB-C power delivery (PD) devices, including portable batteries. If you’re using a Surface Go, the battery or wall charger needs to output at least 29W (though if you’re using a Go, you don’t really need this cable as it already has a USB-C port built-in). The Surface Pro and Surface Laptop demand at least 36W. The company says that best performance is found with 45W or 60W adapters.

This cable is technically not as versatile as Microsoft’s adapter since it doesn’t support data transfer or video output; it’s solely used for charging. J-Go’s founder Jay Terry tells me that the company is in the process of developing a product that can support those functions, but he doesn’t know when that might come to market.

Even with those limitations, the Surface Connect to USB-C Charging cable makes it easy for Surface device owners to charge their laptops with the same power brick they might use for their phones or use a portable battery pack to juice up on the go. Until Microsoft fully adopts USB-C across its devices, this is the next best thing.

Vox Media has affiliate partnerships. These do not influence editorial content, though Vox Media may earn commissions for products purchased via affiliate links. For more information, see our ethics policy.


Pro 4 charger wattage surface

The Microsoft Surface Pro 4 Review: Raising The Bar

Battery Life

One of the trade-offs that Microsoft has made with the Surface Pro 4 is a reduction in battery capacity. Ever since the first Surface Pro was launched, Microsoft has equipped it with a 42 Watt-hour battery. That is a large size for a tablet, but the Surface Pro has always been a larger than normal tablet too. With the Surface Pro 4, the battery capacity has been reduced slightly to 39 Wh. Part of this is the thinner chassis, and part of it is the new hybrid cooling which puts a copper plate over the battery. I can’t argue with the new cooling system, since it has clearly made a big difference in thermals.

To take a look at battery life, I’ve run both our tablet battery tests and our notebook battery tests. As with all of our battery life testing, the display is set to 200 nits for a consistent result across devices.

Tablet Battery Life

Web Browsing Battery Life (WiFi)

Looking at our tablet web browsing test, the Surface Pro 4 comes in right around the same battery life of the Surface Pro 3, running out of power about 13 minutes sooner. When you think about the move to Skylake, this could be taken as a disappointment, and I honestly thought it might be able to get a bit more. But the smaller battery capacity and increased pixel density both negatively impact batter life despite the CPU using a bit less power itself. I would have loved to see the larger battery stay, which would have given it about 8.5 hours, but the improved cooling system is likely a better trade-off compared to around 30 minutes of battery life.

Video Playback Battery Life (720p, 4Mbps HP H.264)

Once we shift to a more CPU-intensive workload however we start seeing significant gains. Intel has been making good progress on their video decode power consumption since Haswell, and the Surface Pro 4, despite the greater pixel density and a smaller battery, achieves 23% longer battery life than the Surface Pro 3 at this task. This is a great result and puts the Surface Pro 4 more in line with what traditional ARM based tablets can achieve.

Notebook Battery Life

Battery Life 2013 - Light

Once again the Surface Pro 4 falls right in line with the previous generations for battery life, which means that the efficiency has been improved even though the panel is much denser. While certainly not class leading in overall life, for the size of device and performance available, it is a pretty good result. Being able to keep battery life flat, while improving the display resolution, and making the device thinner and lighter, is in line with what you would expect as they pack more and more power efficient parts into the Surface Pro 4.

Battery Life 2013 - Heavy

Under our heavy battery life test we can really see the improvements with Skylake. The Surface Pro 4 battery life score on our heavy battery life test outlasts the Surface Pro 3 by 21%. The heavy test involves video playback, which we have just seen in the tablet workload is significantly improved, as well as a much higher web load and a 1 MB/s file download. Once again, the Surface Pro 4 is not going to be able to compete with notebooks with much larger batteries, but for the size and weight of the device, it is a good result.

Next up let’s break down our results by energy efficiency.

Battery Life 2013 - Light Normalized

Battery Life 2013 - Heavy Normalized

The XPS 13 is the class leader in battery life at the moment, but it achieves this with the 1920x1080 display. In order to be more comparable to the Surface Pro 4, the graph shows the higher resolution 3200x1800 version which was still able to get some pretty good battery life scores. The Surface Pro 4 manages to be more efficient than every other high resolution device we have tested, although lower resolution devices are still able to offer greater overall efficiency.

Charge Time

Microsoft has kept the same charging system from the Surface Pro 3, with the Surface Connect port providing the connection. This hasn’t changed since the last model, but I do like the magnetic connector and how well it always attaches. I kind of wish Microsoft had added a USB-C here as well, but the Surface Connect port is a pretty nice implementation. Unsurprisingly then, the charge time does not change very much at all compared to last year’s model.

Charge Time

Battery Charge Time

I recorded a 158-minute charge time with the standard charger. Microsoft also offers a higher wattage 60 W version for use with the Surface Book, and you can also purchase it as an accessory for the Surface Pro 4. The result with that charger? 158 minutes. The Surface Pro 4 did not dump any extra power to the battery at all with the higher wattage charger.

Once other nice part of the Surface Pro 4 charger, which also carries over, is the included 5 W USB port on the charger itself, so you can charge up your smartphone without burning two outlets. It’s a small thing, but when you are at a hotel where outlets on the desk are at a premium, it’s nice to be able to do this.

Surface Pro charger not working - Surface Pro power adapter problem

The powerful male weapon seemed to have grown even more in size and turned to stone, then the penis trembled, vibrated, and the head, smooth and red. Like a ripe cherry fruit, throbbed. I put my lips around the head. Your body shudders.

Now discussing:

There is no focus. All honestly announced the number with the swallowing of the assistant alive and the number is executed. the trainer answered from the arena to the hall.

2133 2134 2135 2136 2137