If you're a rooted user, chances are that you flash new ROMs fairly often. What you may not know, however, is that your phone saves the battery statistics from old ROMs, and if you've never recalibrated your battery before, then your time away from the charger may not be as good as it could be.

This is for rooted users only.

Resetting battery stats can be an intimidating task for those who don't spend a lot of time in recovery (or who have never even booted into recovery). Fortunately, XDA member marosige has created an app that makes battery calibration a snap.


It's really simple (the instructions are even clearly stated within the app) - launch the app, charge your phone to 100%, unplug it, and tap the "Battery Calibration" button. The recalibration process will begin at this point, and generally takes a few days to complete. Use your phone normally and enjoy the additional battery life!

As always, check out the support thread in the XDA Forums if you have any questions.

Source: XDA

Cameron Summerson
Cameron is a self-made geek, Android enthusiast, horror movie fanatic, musician, and cyclist. When he's not pounding keys here at AP, you can find him spending time with his wife and kids, plucking away on the 6-string, spinning on the streets, or watching The Texas Chainsaw Massacre on repeat.

  • Eric

    I'm using a 3500mAh extended battery on my Evo. Wonder if this will improve battery life even greater. Will let you know.

  • John Doe Android

    What, no QR code?

    • Cameron Summerson

      This one is only available on XDA for the time being.

  • Dave

    anybody can attest if this works?

  • Dan P.

    On Nexus S is not working because I couldn't reach 100% charged battery at any time since I got my phone 3 weeks ago. It stops at 98% and the application require the battery to be charged at 100%.

    Therefore I couldn't test it!

  • http://www.boundlesstechnical.com/ Christina

    I'm going to test this later on today with my husband's Droid X. Does anyone else with a Droid X know if this works?

    • Dave

      yes it does work. but then the next day it didnt fair too well. the first time i calibrated it my batt life with full charge lasted me 15h the next day i saw maybe about 8-9h which is still pretty good so to speak

  • Carlos G.

    Yeah this hack is fully functional, my samsung galaxy s GT-I9000, the battery duration is the 2 days... Repeat only Samsung Galaxy S GT-I9000

  • http://forum.xda-developers.com/showthread.php?p=12699287#post12699287 marosige

    A new version is avalable on Android Market.
    QR code is in the XDA Thread!

  • Ollie

    you don't need an app to do this- many recovery roms will allow this file to be deleted, or you can delete it yourself if you are rooted.

  • Paulus the walrus

    I just used cwm recovery and deleted my battery stats, I't's in the advanced menu. I could not get this program to work on my Galaxy Note 10.1 GT-N8010.

  • JJ B

    Is there something similar for kindle fire hd... I have not rooted it but I have tried everything I can find (which consists of resetting (20 sec power cycle) at different times). My battery monitoring software is out of sync big time the KF is dying with the montior saying it still has a 90% charge well anywhere between 50 - 90 percent it differs. I'm now using an appropriate charger/ wall plug that charges 20w, which i thought would eventually resync it. So I am now thinking of rooting if it is possible to recalibrate the battery.