Use APKPure App
Get Battery Charge Discharge - Calculator old version APK for Android
Calculates the charge and discharge time of the battery
Allows you to calculate the charging time and the battery discharge time.
Enter battery capacity and consumption or charge.
The result will be provided in A(ampere) or mA(milliampere).
Results can be archived, emailed, or use any other sharing feature available on your phone.
All very easy.
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It's free !!