AccuBattery: Accurately Monitor Your Battery
Every time you charge your device, it wears out the battery, lowering its total capacity. Research shows that battery lifespan can be extended up to 200%, when you charge your device to only 80%. AccuBattery measures the actual battery usage. You can monitor precisely how much battery your device is using and know how long you can use your device when it’s active or in standby mode. You can also find out how much power each app uses.
Stats include charging time and optimum battery capacity. It allows you to see how much wear your battery sustains with each charge session. You can even look up the discharge speed and battery consumption per app. The (paid) professional version, has real-time CPU (central processing unit) and power usage overlay for spotting battery draining processes and has no ads, besides having many more features. In short, the app is designed to keep your battery in the best shape possible!
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