Here is a simple way to recalibrate your Android Device’s Battery without rooting or installing any third party apps. It takes a little while to get done but is great in giving a good boost to battery life.
With your Phone/Device on and charge it for 8 hours or more.
Turn your device off and reconnect your charger to it. Charge it for one hour.
Turn on the device and wait 2 minutes.
Turn your device off again and charge it for another hour.
Disconnect the charger, turn the device on and use as normal.