A free program for Android, by JINASYS.
BatteryWidget is a widget that displays an exact battery level on the status bar, health, temperature, voltage, and CPU usage. It is a handy utility to help you keep track of the battery charge level in your Android device at all times.
BatteryWidget can also show the current temperature and voltage of the battery, as well as its remaining capacity. If the screen is turned off or the device is in use, the widget will not drain your battery charge.
To make things even more convenient, you can configure your device's settings to show the widget on the lock screen or on the status bar.
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