How to Calibrate the Battery on Android Devices to Get Better Performance


Android devices have always been about raw power. Ever since the boom in the hand-held technology space, it has helped push the limits of processing power at hand. This mad rush for more and more CPU-GPU performance and higher screen resolutions did help us in reaching the point where smartphones are no more the poorer siblings of their bulkier desktop counterparts. But in the long run, we also got stumped in one of our essential requirements — the battery. While devices did get bigger, the waistline too needed to reach remarkably low dimensions! And to get that little more oomph from your phones miniscule battery rating, sometimes you might need to calibrate the battery to get better performance.

Well we all know that the battery life should be an aspect taken care of by device manufacturers out-of-the-box. But wouldn’t we be expecting too much from them, knowing that smartphones are probably the greatest all-in-one gadgets around — serving as your digital Camera, mobile computer, media consumption device, and not to forget, your phone! We know that device manufacturers have tried pretty hard to fit-in bigger batteries in devices this year, and some of them are surely compelling in terms of usage time. Android Lollipop too might bring-in some changes to turn the tables, but let’s be honest, we do need to cope with out KitKat devices first. Enough of the commentary, let’s skip to the stuff that matters now.

Knowing the term : Calibration

So what exactly do we mean by calibrating your device battery? Well, Android has a built in battery stats indicator within the settings menu. This feature allows the OS to keep track of the current battery level on your device. Sometimes, if the battery isn’t calibrated, it may lead to wrong battery stats in your OS due to incorrect detection of battery level. How will it hurt, you might ask. Incorrect battery level detection may lead to your OS identifying that your battery is empty and shut down your device even when in reality it might have, say, 5% battery juice left. Is that convincing enough?

Now, there are two methods to get this done. The clumsier method is obviously for users without Root, and we’ll focus on that first.

For Non-Rooted Devices

If you have no idea regarding how to root your Android device, this is the way to go. Even though this procedure is a bit on the clumsier and lengthier side, this is your only option if you don’t have root. There are many apps too which promise battery calibration for non-rooted devices, but they are a hit or miss many a time. So, get your charger handy and follow the below mentioned steps.

  • Firstly, boot-up your phone, and charge it until the battery is full. (We’d suggest charging it for at least an hour extra well after the phone shows 100%)
  • Unplug your phone, and switch it Off immediately.
  • Plug your phone back in, and charge it for another hour.
  • Now, switch your device On again, and repeat the full charge process of atleast an hour.
  • Repeat step two and three.
  • Now, once this is done, use your phone normally, but charge it to 100% next time only after the battery has completely drained.
  • That’s it! Android must now be having a better idea of your device battery level.

This whole procedure essentially erases and resets the battery stats database to the way it should be. Just so you know, irregular charging sometimes is the culprit behind wrong battery estimation.

For Rooted Devices

Method I

If you have a rooted device, you are in for some luck. The procedure for calibration on rooted device is comparatively a lot simpler. There are simple apps available out there which can do all under-the-hood stuff while deleting your batterystats database bin file. There are many options available for this, but we shall suggest the simplest one for you which we have tried.

Battery Calibration
NéMa Tools Free

Just head over to the Play Store from the widget above and download the app first. It’s one of the simplest apps for performing the task at hand. Once you launch it, you will be greeted with a start screen similar to the one below.


Now,  follow these steps.

  • Once you have downloaded the app, launch it. You will be asked to grant Super User permission for the app here. Accept it.
  • Now plug your phone to the charger and charge your battery to 100%.
  • As soon as your device is fully charged, click on ‘Calibrate’.
  • Now unplug your phone from the charger.
  • After this is done, you should complete one full charge-discharge cycle. (noticed the ‘should’ve in that sentence? Aye, that means it isn’t necessary)
  • Done!

Method II

If the first method doesn’t work for you, try this method. Remember that this method requires you to have a working Recovery installed on your phone.

  • Firstly, go into recovery mode on your device and then navigate to the Advanced section where you will find the “wipe battery stats” option. This will erase any previously made calibration either by the user or over time. This will also help if a fresh ROM is installed and the phone battery display is going wonky.
  • Second, you have to fully drain the battery and then connect the phone to the charger. Charging must be carried out without any interruption and the device should be switched Off.
  • When the battery level reaches 100%, turn it On again without disconnecting from the charger and open the Battery Calibration application. Click on the center button, which will prompt SuperUser permissions to pop up that you will have to accept.
  • After this, a pop-up will appear stating that the battery calibration has been succeeded. Then, Press OK, and unplug the device from the charger and close the application.
  • That’s it!

Method III (for people with ROOT, but no working Recovery)

  • Launch Root Explorer, or any other file manager with access to your Root directories.
  • Now head over to the ‘/data/system’ folder, and find the ‘batterystats.bin‘ file.
  • Delete this file. Don’t worry, Android recreates this file when you reboot your device or plug-in the charger. The above-mentioned methods too focussed on deleting or resetting this file only, one way or the other.
  • Now reboot your phone and follow the steps henceforth from Method II above (except, obviously, for the first step there).
  • Sometimes a simple reboot after the deletion calibrates the battery back, but to be sure, it’s better to follow those steps.

So that’s it! We have tried to cover almost all working methods for battery calibration which will correct the erroneous display of current battery reading on your device. You might want to do it straight-away, but we need to remind you that users who have installed a custom ROM, should definitely follow the guide to fix the calibration! This is so because there have been more than a few instances where users have reported seeing a sudden drop in battery level at some point, even though it remained stable for some time (e.g. battery level suddenly falling from, say, 60% to 30-40%). This might happen because the Custom ROM installation messed up your batterystats file. Other less advanced users (who don’t really enter the realm of Custom ROMs and MODs) might suffer from this problem due to infrequent and irregular charging patterns or issues which arise from some third party apps.

Suggestions for any other working methods are welcome in the comments section below.

  • Chris Exploiter

    i want to ask you … about my note 4 .. estimate time usage with 100% is 18h 20min !!! this is not wright ! in idle my phone will must indicate more than 18hours estimate time usage … .

  • NewFaceKilla

    What, are you me Kumar??? What do you listen to?