For Rooted Android Phones – How to Calibrate Battery


The Droid Razr Maxx is an amazing phone with great battery life. So you can imagine why I almost panicked when I saw that only after having it for a few weeks, my phone was dying in only a few hours. At first I thought it was a new firmware update that was the culprit. But after seeing that there had been no new updates lately I came to the conclusion that it was an app that was causing the problem. My Android OS was almost at 75% battery usage, which was incredibly unusual since it was never that way before. After uninstalling multiple apps and freezing just about any app I didn’t use with Titanium Backup, I still saw no improvement with my battery life. After tons and tons of research I finally discovered that my battery needed to be recalibrated.

In this article I will show you how to calibrate your battery in order to get the best battery life possible. This is recommended to be done after flashing a new ROM and after every 40 charges or so.

The first step is to get your battery life up to a 100% full charge hard drive recovery. Do not just wait until the light turns green. It has to be fully charged. You can make sure your phone is fully charged with almost any battery widget. Or you can go to the menu settings and click ‘about phone’. Then click status and you should see the battery level and it should say full.

The next step is to delete the battery stat.bin file. There are two different you can go about doing this. One way is to download the battery calibration app. After downloading it, plug your phone into the charger and wait for it to hit a 100 percent full charge. Then click ‘battery calibration’ and unplug your phone.

The other way is to boot into recovery. You can do this by going into ROM manager and clicking ‘Reboot into Recovery’. Once you are in recovery go down to advanced. Then click wipe battery stats and click yes. Don’t worry, this is safe to do. It should delete it almost instantaneously. You can now reboot your phone.

Once your phone has rebooted, unplug it from the charger. Now use your phone normally and let the battery run all the way down to 0% so that it is completely drained and won’t turn on any longer. Then you want to plug the phone back into the charger and charge it (WITH THE PHONE OFF) until it is at 100 percent again.

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