Originally Posted by dbutters
I am getting about 7-8 hours of normal use out of this battery, which is a few hours longer than the stock. One thing to note, however, and I'm not sure why, but last night I let it get down to the 15% warning and at 10% it just died and wouldn't turn back on. Charged up and we're fine now, so I'm not sure what happened.
You need to calibrate your battery. Or rather the battery bin file that android uses to measure your %.
Charge to 100%, download and install the battery calibration app. While you are still plugged in at 100% run the app. Take off your back cover (so you can pull the battery quickly) and click on the button that says Calibrate battery. This will delete your batterystats bin file. Immeditely pull the battery.
Wait a minute, then put the battery back in (Leave the phone off). Plug in charger and allow it to charge to top off the battery with the phone off for about 10-15 min. (If you notice the little LED that is generally orange when charging at the top of your phone will turn green when fully charged).
Next unplug from the charger and turn on your phone. Your phone will create a new bin stats file on boot and start recording your battery drain time.
Use your phone as your normally do until it dies at 0% completely.
Next connect to your charger, allow this to charge for 5 min while off. Then turn on the battery while connected to the charger and the phone will then record your new battery charge rate. It is important that you leave your phone on when charging this initial time.
You need to do this anytime you change your battery or your ROM.
Also to those people who say you cant train or calibrate a these types of batteries you are correct, you are calibrating the statistics android uses to monitor your charging and discharging rates not the actual battery.
Your phone detects low battery voltage and turns itself off based on the recordings. This does not actually extend your battery run time it simply gives android a more accurate point of measurement.