The HTC One M8’s 2,600mAh battery is said to last for 22 hours of talk time and 528 hours in standby when running Windows Phone, according to the smartphone manufacturer. Meanwhile, the Android version lasts for 20 hours of talk time and 496 hours in standby.
Verizon, who will be carrying the device in North America, carried out tests that produce a more drastic result. According to Verizon, Android users get 12 hours of usage time and 12.2 days on standby compared to 21 hours and 15.5 days respectively on Windows Phone. It is unclear what tests are carried out by HTC and Verizon for these results, but it is clear that Windows Phone users get more usage from their device.
The two handsets run identical hardware, so it is evident that Windows Phone 8.1 drains less battery power than the Android operating system.
Spokespeople from both HTC and Verizon are looking into these results.