How to calibrate the battery on your Android phone or tablet

How to calibrate the battery on your Android phone or tablet

Wondering how to calibrate the battery on your Android smartphone? Looking for answers on why calibrating the battery is even necessary? Well, these are some of the questions we aim to answer with the help of this article.

What is battery calibration?

The Android operating system needs to keeps track of your battery and charge levels so that it tells you when it is full or empty. The problem is that it sometimes becomes corrupted and starts displaying data that isn’t real, which, for example, causes the phone to turn off before it reaches 0 percent. This discrepancy in data can also be caused by aging.

All batteries degrade over time, and an older battery can no longer hold as much charge as it did when it was new. However, the software your phone runs do not usually take this degradation into account while displaying the battery status on the screen.

Calibrating your Android battery simply means getting the Android OS to correct this information, so it is reflective of your actual battery levels once again. It's important to understand that this process does not actually calibrate (or improve) the battery itself. Nor does battery calibration improve the battery life of your phone. It will only help the phone accurately display battery stats.

When should I calibrate the battery?

battery smartphone charging
Wondering if your smartphone battery needs to be calibrated?/ © NextPit

Calibrating your battery isn't something you'd do on a regular basis. As mentioned earlier, battery calibration archives only one purpose: ensuring the battery stats displayed by the phone are reflective of the actual condition of the battery. In case you aren't facing any issue with your phone showing you erroneous battery stats, chances are, you do not need to calibrate your battery. Listed below are the circumstances under which it might be a good idea to calibrate your battery.

  1. Your smartphone suddenly shuts down even after it showed there was enough charge left. 
  2. If your charging percentage remains stuck at a single point for long periods of time.
  3. Your smartphone is really old, and you suspect the battery stats shown are inaccurate. 

Before you calibrate your smartphone battery

Sometimes, it is simply easier (and better) to replace your smartphone battery than to flog an old horse and try calibrating them. This was easier to do on older smartphones that had removable batteries. On such devices, checking the battery for damage/issues was easy as turning the device off, removing the cover, and inspecting the battery.

If you do have such a phone lying around, you will need to look for bulges or leaks. In the image below, you'll see what a normal battery looks like next to a swollen one.

AndroidPIT Smartphone Overheating 2583
A swollen battery is easy to spot. / © NextPit

On most modern smartphones, removing the back cover isn't an option, and there is no way to take a peek at the physical condition of the battery. However, one method of identifying a damaged battery on smartphones with non-removable batteries is to check if it doesn't sit flat on the table anymore - a situation that can often arise due to a swollen battery. 

Additionally, calibrating the battery is not an all-weather fix to any battery-related issue.

This is because there are plenty of other things that can cause a battery to malfunction. If your phone doesn't charge, there might be a problem with the port, so check our guide on what to do when a phone won't charge.

In case you recently updated your phone to new software, and the battery-related issues have manifested right after, chances are it is caused by the new firmware and not the battery itself. In such a scenario, it is better for you to simply wait for the brand to issue a fix.

How to calibrate the battery on Android smartphones?

androidpit phone battery
These steps should help you calibrate the battery on any Android smartphone / © shutterstock.com

The process mentioned below is applicable to all Android smartphones. In case you own a Samsung device, click here.

  • Discharge your phone fully until it turns itself off.
  • Turn it on again and let it turn itself off.
  • Plug your phone into a charger and, without turning it on, let it charge until the on-screen or LED indicator says 100 percent.
  • Unplug your charger.
  • Turn your phone on. It's likely that the battery indicator won't say 100 percent, so plug the charger back in (leave your phone on) and continue charging until it says 100 percent on-screen as well.
  • Unplug your phone and restart it. If it doesn't say 100 percent, plug the charger back in until it says 100 percent on screen.
  • Repeat this cycle until it says 100 percent (or as close as you think it's going to get) when you start it up without it being plugged in.
  • Now, let your battery discharge all the way down to 0 percent and let your phone turn off again.
  • Fully charge the battery one more time without interruption and you should have reset the Android system's battery percentage.

How to calibrate the battery on Samsung smartphones?

Samsung smartphones come with an option called 'Quick Reset' that is usually accessed by the technicians to calibrate phones that report inaccurate battery stats. Here's how you can use this option to calibrate the battery on Samsung devices.

  • Use the smartphone until it reaches 5%, and make sure your phone isn't connected to the charger.
  • Open the phone dialer app and enter the following code: *#0228#.
  • A pop-up menu appears with an option that says 'Quick Start'.
  • Press 'Quick Start" and then press 'OK.
  • Wait for the display to power back on again and check if the battery percentage has gone down.
  • Charge the phone to 100% again.
  • Power the phone off and then turn it on again and then unplug the charger.
  • Repeat these steps 2, 3 times
  • Plug the career in again and the battery at 100%, turn the phone on again and open the dialer, and type: *#9900#.
  • Scroll down to "batterystats.bin reset" and tap.
  • Exit the menu and restart the phone.

Remember that it is not recommended performing this process regularly. Even when your battery is so dead your phone won't even turn on, your battery still has enough reserve charge to avoid system damage. But you don't want to poke the tiger with a stick. Perform this process once every three months at the most. If it is required more often than that, you have bigger problems at hand.

Put plainly: fully discharging a battery is bad for it. Trying to overload a battery is also bad for it. The good news is that charging batteries will shut off automatically when they've reached their safe limit and there's always a little in reserve even if your phone won't start. Again: only do this when really necessary, because it does have a negative impact on battery life.

Also Read

That's it. Have you tried any of these methods to calibrate your battery? Do you know an alternate way to fix battery problems? Let us know in the comments.


This article was last updated in June 2021. Older comments have been retained.

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  • Thank you, thank you and thank you! I searched in the past about methods to calibrate my S9's battery but none solved the issue. This one (root method) did. In my case it worked because I took good care of my phone from the very beginning - I used to charge it (35-80%), - and about 2 years later a calibration was required.


  • sony 4 months ago Link to comment

    I've tried no.1 but my phone still keeps draining to 50% really fast, then shuts down saying it's low on juice


  • Nice


  • marco sarli
    • Admin
    9 months ago Link to comment

    Interesting and educational but the real solution would be to have removable batteries again.


  • Tahseen 11 months ago Link to comment

    I had the same issue with my huawei p7... Tried everything... Changed new battery... Problems solved for a day or two and then reappeared...

    Then shown again to a technician... He pushed the battery terminal and the phone worked fine for few hours and then started again...

    He said again new battery to replaced... I told him battery is brand new... Just Keep the terminal pushed and hold with thumb and the phone was working fine... Then he told me that there is a problem with the battery cables terminal sits on the board... And he inserted some packing of double tape... Now the phone working excellent for few hours... Let's see if it remains good InshaAllah for future...


  • xkip Jun 6, 2020 Link to comment

    The sentence about "app ask for a disturbingly extensive list of device permissions" does not make any sense here. This should not worry root users. Root provides way more access than android permissions, so the app becomes a God even if there is no android permissions been asked at all.


  • Very useful! Thank you


  • Very Nice Info and method 1 works


  • Siamak Jun 23, 2019 Link to comment

    On HTC One M8, you could reset battery stats by connecting your phone to the charger, leave it charge for two minutes, then push and hold the 3 hard buttons on the phone for 2 minutes and the battery stats would be reset (according to HTC official support. What is the procedure for an HTC 10?


  • Thanks for your instructions. In method 1 for battery calibration, in the final step. Should i turn the phone on to charge it fully or off? Thanks.


  • ok to help some of you out I have tried all other ways to reset the battery but only one has worked for me I have a Galaxy S6 im running a custom software and im rooted so maybe it only works on that type of set up but i charged the phone to 100% and reboot until the battery stays at 100% when you turn it on then i reboot a few times just to make sure its fully charged the if your rooted do a fast reboot until the batterybis 100% ,next you must go to the dailer and type in (*#0228#) and it will go to the battery setup dont do this part until your sure the battery is at 100% cuz it wont work unless uts 100% do the reset test like 2 or 3 time just to get it to callibrate it will now show you your real % somewere around 50 or 60 % for wost phones dont let the phone discharge you must charge to full 100% and phone must say full not just 100% and repeat the prosses till when you reset the battery with the *#0228 it stays at 100 % and then the battery will be fully charged .a side note dont discharge your phone all the way ever it corupts the battery senser,the phone doesnt need to be discharged to do the reset it just needs to be fully charged at 100% and say full best if done with charger attached so as to not discharge in the prossess.Hooe this helps some of you out.as for why the phone says media divise dissconected 8t is the phones romming that is being dissconected over and over again untill you loose all power sense your phone isnt really charged all the way .put your phone in airplain mode to see if that stops the dissconnecting problem if it does then you know that its a app that has to do with service .


    • dane Apr 14, 2020 Link to comment

      imao sam veliki problem baterijom a ovo sta ste napisali je pomoglo..mislim da je to jedini naičin da se nesto napravi,bio sam samo jedan korak do bacanja telefona u smeče..zahvaljujem:)


  • This app wants me sign up, get through my firewall, get a bunch of permissions AND SHARE RESOURCES. You are NUTS!!!


    • -- F-Droid is your friend - go to fdroid site (repository) and search for battery callibration. All open source, warnings if anything uses proprietary code / libraries / resources, and community watches for permissions and what's ACTUALY done with them.


  • I don't follow this. The article talks of two different acts. Disconnecting the charger, and disconnecting the phone. For some time I wondered if the phone was looking for the inactive charger as a trigger. I think reading between the lines, it's just written a little awkwardly.

    I am a muppet. I need muppet proof instruction.


    • I'm back.. Sorry to of not added anything useful before. I was at a loss. Now I understand, it's interesting to see how literal I expected the instruction to be.

      For others phased out by this procedure, I will put it into a local direlect.

      You flatten it completely. Then try switching it on again, to flatten it a bit more. Just let it turn itself off. Next, without switching it on, you charge it right up. Then stop charging and switch the phone on. If it says it's full still, then flatten it again, then charge it again without switching the power. Done. Hopefully. You can walk away. However, if it didn't say full when you switched it on...

      Charge the phone to full. Then stop charging and reboot the phone. If it says less than full, Then start this chapter again. If your repeating this chapter, the battery will be a bit closer to full following each reboot. Once it manages to reboot and say it's full still (or you decide it's not going to) Than as per the first chapter. "Flatten it again, then charge it again without switching on. Done"


      Thank you for showing me this. I'm about 4th time round, and have gone from 59% to 64% using a phone left flat for months. As I charge past 69% I'm seeing 4.345V (using *#0228#) which is very close to the 4.38V I would personally bottle out at. Passing 75% it's still at 4.345V and did waver Higher to 4.352V passing 73%. Edit: Passing 85% now, the Voltage had table topped.

      I discharged mine recording video. I know batteries moan about camera's and filming keeps the screen on. I also put on the WiFi, Bluetooth and GPS, but the screen and camera were the most power hungry. I forgot the torch.

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