Recalibrate Battery - Resets battery stats to get better/accurate battery life; should be done after flashing a ROM I will list three most accurate ways to recalibrate battery, more accurate than using market app; for people who don't know. These method are similar but you get the picture of what you have to do for a successful and most accurate battery recalibartion Drain Battery Drain your phone battery until its fully dead, till it turns off then power it back on(to see if it has any left), and drain the rest. Now charge your phone while phone off. Delete battery stats under “Advanced” option and then power on the phone in CWM. Now drain your battery like step one. Now charge your phone fully while powered off. Power Off Charge Charge your battery till 100% powered on Unplug the charger from the phone, power off your phone, then charge till fully charged. Unplug the charger from phone. Power back on your phone then charge to 100% Unplug the charger from the phone, power off your phone, then charge till fully charged. Unplug the charger and go into CWM. In CWM, go to "Advanced" and then clear battery stats. Power off phone and charge till 100% Power on and drain battery completely, power it back on to see if it has any charge left Charge phone powered off. Power On & Off Way When your phone is powered on, charge the battery until the indicator is at 100%. Unplug the phone from the charger and power off phone When the phone is off, plug the charger in, and charge till 100% Unplug and power back on Then power phone back off. Charge Till 100% Now go into CWM and go under "Advanced" and wipe battery stats. Power on and drain battery till it turns off, try to power it back on and drain the rest if it has any more. Charge completely while powered off Easier But Normally Less Accurate Option Use and follow instruction from a battery calibration app from market. The best in my opinion is 'Battery Calibration', the one with a green android with a percent sign.