AccuBattery measures actual battery usage using information from the charge controller. Per-app usage is determined by combining these metrics with information about which app is in focus.
Android calculates battery usage using predefined characteristics provided by device manufacturers, such as how much power the (CPU) is using. However, in practice, these numbers tend to be largely inaccurate.
Track how much battery your device is using, find out how long you can use your device when it's active or in standby mode, find out how much power each app is using, check how often your device wakes up from sleep.
Also, use AccuBattery to find the fastest charger and USB cable for your device, measure the charging current (in mA) to find out, check how fast your device charges when the screen is on or off, find out how much time it takes to charge your mobile phone.
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