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How to calibrate the battery on your Android phone or tablet

Authored by: Loie Favre — 9 months ago

Battery problems are one of the biggest concerns for smartphone users, which is why we offer many useful tips and tricks to solve battery drain problems. If you notice that your battery performance and duration has decreased, it could be time to consider calibrating your battery. If your battery isn't exchangeable like the Nexus 5 or easily removable like the Galaxy Note 4, we will explain how to calibrate the battery of your Android and what it actually does.

galaxy s4 mini 20
If battery starts slowing down and acting up, you should calibrate your battery. / © ANDROIDPIT

How do I know if my battery is the problem?

First of all, if you have had problems with the performance of your battery, you can consult our tips and tricks to extend battery life on your Android smartphone. If you notice that the performance continues to decline, then it’s time to try to calibrate the battery.

One of the most obvious signs that it’s time is when your mobile battery drains quickly or the device won’t charge. These symptoms can sometimes be attributed to apps or runaway processes in the background though. Users that have encountered these problems may think the battery or device is damaged. This may be the cause, but before doing anything drastic, we highly recommend trying to calibrate the battery properly.

To check for damage, the most obvious visible sign is a bloated, swelling or leaking battery. This is dangerous and a battery showing these signs should be removed immediately and replaced or taken to a service center.

What does it mean to calibrate a smartphone?

The Android operating system has a setting called Battery Stats which indicates the battery capacity, when it is full or empty. The problem is that it sometimes become corrupted and starts displaying data that isn’t real, which causes the phone to turn off before reaching the 0%. The process of calibrating the battery would correct the information.

How to calibrate Android device battery without root access

Method 1

First you must check the capacity of your battery, which you can see on the battery or by searching for its specifications on the internet. Check our hardware section for your device.

Install an application called Current Widget: Battery Monitor:

CurrentWidget: Battery Monitor Install on Google Play

This application will show the battery charge in milliamps (mAh). Charge your smartphone for the duration of time needed until you reach the total milliampere amount indicated for your specific battery.

When the required amount is achieved, turn off the phone and restart it. The battery will now be charged to 100 % and in theory shouldn’t cause any more problems.

androidpit currentwidget battery monitor
Current Widget: Battery Monitor will show your battery charge in milliampere. / © ANDROIDPIT

Method 2

Fully charge the battery with the phone on and when the phone is fully charged, unplug the charger and turn it off.

When your phone is off, plug it into the charger and let it charge to 100% again. The green LED light will indicate when this is done.

Next unplug the charger, turn on your phone and set the option to ensure that your screen doesn’t turn off, if you have this option. Then reconnect to the charger and wait for it to charge again to 100%.

Once loaded to 100%, unplug the charger again and do not load until the smartphone turns itself off after reaching a 0% battery level. Once off, fully charge it again and it should work properly. The screen setting can put back to normal again (meaning turn off after a certain amount of time).

How to calibrate Android device battery with root access

Method 1

First, install the Battery Calibration app :

Battery Calibration Install on Google Play

To start, connect your device to charge until the battery reaches 100%.

Then open the Battery Calibration app and check the number of 'mV ' that are next to the percentage, a number that will continue to rise. If the number continues to grow even if the battery is at 100 %, continue to charge the phone.

When the numbers stop rising and the battery is charged to 100%, press the Battery Calibration button and then restart the device. The current level will be recorded as the point of maximum capacity and the old information is deleted in the Battery Stats when a new one with the correct data is created.

If this method didn’t work, try method 2.

Link to video

Method 2

Go into recovery mode on your Android and 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 when having installed a ROM .

Second, you have to fully drain the battery and then connect the phone to the charger. Charging must be carried out without interruption and with the device off.

When the load 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. Shortly after a message saying ‘calibration succeeded" will appear. Press OK, unplug the device from the charger and close the application.

That's it. Have you tried any of these methods? Do you know an alternative way to fix battery problems?

Loie Favre found her way to her present passion for Android and smartphone technology after experiencing an epiphany when she held her Galaxy Note 2. From that point onwards, you can find her with her nose buried in countless Android apps and different smartphone models, and thanking her lucky stars that she gets to work at something she loves.


Write new comment:
  • g454572 4 months ago Link to comment

    Americans have serious problems with SI units...
    The use of "milliamps" should be sanctioned. mA is a current! it has absolutely nothing to do with capacity! mAh is a charge, in this case it denotes the maximum charge that the battery can hold aka capacity. Integrating a current of x mA over one hour gives you the charge in mAh.

  • Odeta D 4 months ago Link to comment


  • TiHo 7 months ago Link to comment

    Well my phone will say its charging.. It'll say 20%then it'll say 3%...I need help!

  • Vinnie 8 months ago Link to comment

    There is some useful information in this article.
    However I have to say that Method 2 under "How to calibrate Android device battery without root access" doesn't make any sense... The app tells you what's the instantaneous current in mA and not what's the current capacity of the battery (mAH). There is no way to understand how charged is your battery (other than a percentage based on the batterystats file) by using the app...

    Also the video posted for Method 1 under "How to calibrate Android device battery with root access" is private...

  • Lloyd Abando 8 months ago Link to comment

    When do I knew when my battery is calibrated?

  • Ted 8 months ago Link to comment

    Your instructions are clear as mud and the CurrentWiget is not working on my S3.

    • ofbarea 7 months ago Link to comment

      Works fine with my S3 running CyanogenMod 11 M12. Try rooting your phone, it should work.

  • Zack Samaco 9 months ago Link to comment

    Hi what do you mean when you say "do not load until the smartphone turns itself off after reaching a 0% battery level." does it mean that you have to wait until it goes to 0% without doing anystuff with your phone or is it ok to use your phone while waiting for it to go down to 0%?

    • Scott Adam Gordon
      • Admin
      • Staff
      9 months ago Link to comment

      Ahhh yeah that could be a little clearer. But yes, it is okay to use your phone in this time. If you want the battery to run down even faster, turn your screen brightness to 100% while your are using it.

  • David Apr 17, 2014 Link to comment

    hi guys love all the help ur giving. question ....ive heard from so many people telling me that leaving ur fone charged all day and nite is bad. Also that its better to let the fone drain a bit ..? thoughts?

    • Kat Hervera 10 months ago Link to comment

      to old batteries it applies. but on your smartphone battery it doesn't. just apply the 40/80 rule when charging your gadgets. also remember to keep it cool. ave. batt life span is 3-5yrs. an ave heat of 32deg farenheit decrease batt life up to 6% of max capacity per year.

  • Amat Mulisha Apr 16, 2014 Link to comment

    does one of this method are harmful to my phone if my battery not having any problem?