Microsoft Surface battery capacity – a complete list

In this guide, you will learn how to convert your Surface battery capacity in mWh to mAh and know about battery information of all Surface models.

Microsoft Surface Battery Capacity

You might have a misunderstanding about battery capacity when it comes to different units. Most of the time, in mobile phones, power bank, mobile’s battery mostly defined by mAh (milliamp-hours). For Microsoft Surface family it might have noticed that the battery capacity is defined as mWh (milliwatts-hours).

In this tip, we will guide you how to convert from mWh to mAh and vice-versa.

  1. How to Convert mWh to mAh?
  2. Surface Battery Capacity

1How to Convert mWh to mAh?

In order to convert from mWh (milliwatt-hours) to mAh (milliamp-hours), we have a formula as below:

(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 that, the Surface Pro 3 has a battery capacity of 5,600 mAh.

2Surface Battery Capacity

Here is the list of the battery capacity of all Microsoft Surface in measured of both Wh and mAh:

Surface ModelWatt HoursMilliampere Hour, VoltsEst. Battery Life
Surface
Surface RT31.5 Wh4,257 mAh, 7.4 V8 hours
Surface Power Cover30.0 Wh4,054 mAh, 7.4 V-
Surface 231.5 Wh4,257 mAh, 7.4 V10 hours
Surface 327.5 Wh7,270 mAh, 3.78 V10 hours
Surface Go26.12 Wh3,411 mAh, 7.66V9 hours
Surface Pro
Surface Pro42.0 Wh5,676 mAh, 7.4 V-
Surface Pro 242.0 Wh5,676 mAh, 7.4 V-
Surface Pro 342.2 Wh5,547 mAh, 7.6 V9 hours
Surface Pro 438.2 Wh5,087 mAh, 7.5 V9 hours
Surface Pro (2017)45.0 Wh5,940 mAh, 7.57 V13.5 hours
Surface Laptop
Surface Laptop45.2 Wh5,970 mAh, 7.57 V14.5 hours
Surface Book
Surface Book69.0 Wh9,187 mAh, 7.5 V12 hours
— clipboard18.0 Wh2,387 mAh, 7.5 V3 hours
— base51.0 Wh6,800 mAh, 7.5 V9 hours
SB with Performance Base81.0 Wh10,787 mAh, 7.5 V16 hours
— clipboard18.0 Wh2,387 mAh, 7.5 V3 hours
— base63.0 Wh8,400 mAh, 7.5 V13 hours
Surface Book 2 13" i569.0 Wh9,187 mAh, 7.5 V17 hours
— clipboard18.0 Wh2,387 mAh, 7.5 V5 hours
— base51.0 Wh6,800 mAh, 7.5 V12 hours
Surface Book 2 13" i775.3 Wh10,027 mAh, 7.5 V17 hours
— clipboard18.0 Wh2,387 mAh, 7.5 V5 hours
— base57.3 Wh7,640 mAh, 7.5 V12 hours
Surface Book 2 15"90.0 Wh12,000 mAh, 7.5 V17 hours
— clipboard23.0 Wh3,066 mAh, 7.5 V5 hours
— base67.0 Wh8,933 mAh, 7.5 V12 hours
More Resources

Note Updated on July 13, 2018: We have updated this article to include the battery capacity of the new Surface Go.