Battery capacity can be measured in different units, and it is essential to understand the difference. In mobile phones and power banks, battery capacity is typically measured in milliamp-hours (mAh). However, the Microsoft Surface family’s battery capacity is measured in milliwatts-hours (mWh).
In this article, we’ve provided a comprehensive list of battery capacities in mAh, mWh, and battery voltage for every Surface device, along with a guide on converting between mWh and mAh.
Table of Contents
Surface battery specs sheet
Below is a list of the battery capacities for all Microsoft Surface devices, measured in watt-hours (Wh) and milliampere-hours (mAh).
Surface Model Watt Hours Milliampere Hour, Volts Est. Battery Life Surface Surface RT 31.5 Wh 4,257 mAh, 7.4 V 8 hours Surface Power Cover 30.0 Wh 4,054 mAh, 7.4 V - Surface 2 31.5 Wh 4,257 mAh, 7.4 V 10 hours Surface 3 27.5 Wh 7,270 mAh, 3.78 V 10 hours Surface Go 26.12 Wh 3,411 mAh, 7.66V 9 hours Surface Go 2 26.81 Wh 3500 mAh, 7.66V 10 hours Surface Go 3 26.81 Wh 3500 mAh, 7.66V 11 hours (Wi-Fi)
10.5 hours (LTE)Surface Go 4 ? ? 12.5 hours Surface Pro Surface Pro 42.0 Wh 5,676 mAh, 7.4 V - Surface Pro 2 42.0 Wh 5,676 mAh, 7.4 V - Surface Pro 3 42.2 Wh 5,547 mAh, 7.6 V 9 hours Surface Pro 4 38.2 Wh 5,087 mAh, 7.5 V 9 hours Surface Pro 5 45.0 Wh 5,940 mAh, 7.57 V 13.5 hours Surface Pro 6 45.0 Wh 5,940 mAh, 7.57 V 13.5 hours Surface Pro 7 43.2 Wh 5,702 mAh, 7.57 V 10.5 hours Surface Pro 7+ 50.4 Wh 6,657 mAh, 7.57 V 15 hours Surface Pro 8 50.2 Wh ? 16 hours Surface Pro 9 46.5 Wh ? 15.5 hours Surface Pro 9 5G 46.5 Wh ? 19 hours Surface Pro X Surface Pro X 38.2 Wh 5,039 mAh, 7.58 V 13 hours Surface Laptop Surface Laptop 45.2 Wh 5,970 mAh, 7.57 V 14.5 hours Surface Laptop 2 45.2 Wh 5,970 mAh, 7.57 V 14.5 hours Surface Laptop 3 13” 45.8 Wh 6,041 mAh, 7.58 V 11.5 hours Surface Laptop 3 15” 45.8 Wh 6,041 mAh, 7.58 V 11.5 hours Surface Laptop 4 13” 45.8 Wh 6,041 mAh, 7.58 V 19 hours (AMD)
17 hours (Intel)Surface Laptop 4 15” 45.8 Wh 6,041 mAh, 7.58 V 17.5 hours (AMD)
16.5 hours (Intel)Surface Laptop 5 13” 45.8 Wh 6,041 mAh, 7.58 V 18 hours Surface Laptop 5 15” 45.8 Wh 6,041 mAh, 7.58 V 17 hours Surface Laptop Go Surface Laptop Go 39.7 Wh 5,235 mAh, 7.58 V 13 hours Surface Laptop Go 2 41.0 Wh ? 13 hours Surface Laptop Go 3 41 Wh Nominal
40 Wh Min? 15.0 hours Surface Laptop SE Surface Laptop SE 35 Wh 4,613 mAh, 7.6 V 16 hours Surface Laptop Studio Surface Laptop Studio 58.0 Wh Nominal
56.3 Wh Min? 19 hours (i5)
18 hours (i7)Surface Laptop Studio 2 58 Wh Nominal
56 Wh Min? 19.0 hours (Integrated)
18.0 hours (RTX 4050)
16.0 hours (RTX 4060)
Surface Book Surface Book 69.0 Wh 9,187 mAh, 7.5 V 12 hours — clipboard 18.0 Wh 2,387 mAh, 7.5 V 3 hours — base 51.0 Wh 6,800 mAh, 7.5 V 9 hours SB with Performance Base 81.0 Wh 10,787 mAh, 7.5 V 16 hours — clipboard 18.0 Wh 2,387 mAh, 7.5 V 3 hours — base 63.0 Wh 8,400 mAh, 7.5 V 13 hours Surface Book 2 13" i5 69.0 Wh 9,187 mAh, 7.5 V 17 hours — clipboard 18.0 Wh 2,387 mAh, 7.5 V 5 hours — base 51.0 Wh 6,800 mAh, 7.5 V 12 hours Surface Book 2 13" i7 75.3 Wh 10,027 mAh, 7.5 V 17 hours — clipboard 18.0 Wh 2,387 mAh, 7.5 V 5 hours — base 57.3 Wh 7,640 mAh, 7.5 V 12 hours Surface Book 2 15" 90.0 Wh 12,000 mAh, 7.5 V 17 hours — clipboard 23.0 Wh 3,066 mAh, 7.5 V 5 hours — base 67.0 Wh 8,933 mAh, 7.5 V 12 hours Surface Book 3 13" i5 69.0 Wh 9,187 mAh, 7.5 V 15.5 hours Surface Book 3 13" i7 75.3 Wh 10,027 mAh, 7.5 V 15.5 hours Surface Book 3 15" 90.0 Wh 12,000 mAh, 7.5 V 17.5 hours
How to Convert mWh to mAh?
To convert milliwatt-hours (mWh) to milliamp-hours (mAh), we use the following formula:
(mAh) = (mWh) / (V)
Example: Surface Pro 3 has a battery capacity of 42 Wh, or 42,000 mWh has battery capacity in mAh as below:
42,000 mWh / 7.5 V = 5,600 mAh
So, the Surface Pro 3 has a battery capacity of 5,600 mAh.
You can also use the calculator below to help you convert from Wh to mAh or vice versa.
COMMENTS
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We appreciate hearing your thoughts, questions, and ideas about “Microsoft Surface battery capacity – a complete list”.
Can you update this with the new Surface Pro stat?
Hi Alsonot, we’ve updated the stat of new Surface Pro. You can have a look now!
huh. so does this mean we should expect similar battery performance from the surface laptop as we do the surface pro?
Hi carlosatUCLA, you are right! However, Surface Laptop will last a bit longer because of it’s less power Core i5-7200U and lower screen resolution 2256 x 1504 (201 PPI), 3.4M Pixels while Surface Pro (2017) has Core i5-7300U and higher resolution 2736 x 1824 (267 PPI), 5M Pixels.
For more information check out here: https://surfacetip.com/surface-pro-2017-vs-surface-laptop/
Can you do it Microsoft surface laptop go.
I believe it looks like there are two 7.5V batteries in series. As the power supply e.g. surface book P/S below
65 Watt P/S:
DC output: 15V@4amps (60 watts) + 5V@1amp
Model: 1706
Are the batteries in series i.e. base and clipboard? Is that why 15V is required?
Or does the base contain two 7.5V batteries and similarly the clipboard contains two 7.5V batteries?
I generally understand that the charging voltage must be higher than the battery voltage to charge the battery. However … double would be excessive and possibly cause the battery damage??
CAN ANY ONE EXPLAIN TO ME WHY THE ESTIMATED RUN TIME OF MY SB2 BASE PART IS ONLY 2:31 ???
As you can see on the screenshot, it’s calculated base on charge rate (Full Charge/Current Discharge rate = 50,340 mWh / 21778 mW =2.31 Hour). The charge rate of the base is 21.7W while on the clipboard is only 2.9W.
And one more thing that you need to know, on Surface Book, Microsoft use an algorithm that will discharge battery in base first, so it can guarantee that the clipboard stay full charge when you need to detach.
My battery – Microsoft Surface Book – died suddenly. The tablett battery is still working, but the other one no, so I cannot use the device as laptop. For the price of this laptop, the death of the battery is a shame! Shame on Microsoft! ???
How do I replace the battery in my Surface RT?
Hello,
Im just a new user for this device (surface book 2) about 1,5 months and would you please explain further how does this device work for 17 hours as described above ? my own experience during this time in fact this device has never reached to 17 hours, in most of the time it only last for about 4-5 hours only and one big issue is the battery also drain fast even it has been shut down properly, what is causing this happened and how to solve this ?
Hello! i am a bit cinfused as i just took apart my surface book 2 to replace the battery and what I found was a 57,3Wh 11,36V battery. This Version is not listed in the table and I was wondering if it is original. I habe the 13,5 inch Performance Model woth the NVidia GTX 1050.
Julian
50.0 watt-hours Surface Pro 7 Plus (2021-01).
46.5 watt-hours Surface Pro 7, according to TheVerge, xda-developers, and other sources.
Surface Laptop 3
6000 mha and only 11 Hours haha
I have Surface Pro 2 dismantled due to battery bubble up. I going to replace it with any universal battery available nearby, so I wonder whether 42Wh and 5,676 mAh, 7.4 V is for each piece of battery? or that spec is the combined of both pieces connected in Parallel?
Estoy buscando un cargador para el coche compatible con surface pro 8, existe?
Gracias de antemano
hi I have surface book 3 15 i7 1660ti I wonder can i charge it with a 65 watt power bank and another question that the adaptor was 102 watts while the microsoft says 127 does that harm the battery?
Hi Sajjad,
Thanks for your questions!
1. Yes, you can use a lower-wattage charger to charge your Surface Book 3, as long as the charger is a Surface charger or a PD (Power Delivery) USB-C charger. The 65-watt power bank is powerful enough to charge the laptop while handling light to medium workloads.
2. Using a lower-wattage charger won’t harm the battery. The thing that negatively affects your battery lifespan is overheating and keeping the laptop at full charge permanently without enabling the battery limit feature. You can learn more about how to turn the feature on here: https://surfacetip.com/enable-battery-limit-feature-on-surface-devices/
I hope it helps!
Thanks,
Ha, can you address what criteria go into estimating runtime? i have a Surface Pro 6 with the i5-8250 CPU / 8 Gb ram – purchased new. it’s never gotten more than 2-3 hours of runtime on a charge when set to very power-frugal operation. it’s maybe an hour when the CPU and screen performance are turned up.
does anyone know if the akku for the Surface Go 2 is the same as the one for the Surface Go 3?
In other words..does the akku for the Surface Go 2 also fits the Surface Go 3?
Because I cant find an akku for the Surface Go 3, but I find one for the Surface Go 2