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Inside the HTC 10 is an 11.55 Wh (3,000 mAh at 3.85V) non-removable lithium0ion battery, which is a fairly standard battery capacity for a smartphone of this size. Thanks to the efficiency improvements moving to the Snapdragon 820 SoC, I expected to see marginally better battery life than previous generation Snapdragon 810 smartphones, and that's exactly what the HTC 10 provides.
In most of our tests the HTC 10 produced slightly above average battery life, passing the important five-hour barrier on our browsing tests, which tends to indicate a phone will last through a day of moderate usage without significant issues. The battery life is still behind the best smartphones out there, such as the Galaxy S7 Edge with its 3,600 mAh cell, but I don't see any reason to complain about the stamina of this device.
The HTC 10 is also an extremely fast charger thanks to Qualcomm Quick Charge 3.0. A full charge through the included charger takes a little over an hour and a half, but you can expect to charge from 20% to 80% in just 40 minutes, putting it right at the top of our charts.