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How to Calibrate an iPhone Battery in 6 Easy Steps

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Poor battery life is a perennial complaint of smartphone owners. It doesn’t matter whether you’re an iPhone or Android user; if you use your phone a lot during the day, the battery will be lucky to make it to sundown.

However, did you know that something as simple as calibrating your iPhone battery can help? Let’s take a closer look at how to calibrate an iPhone battery and why calibration is important.

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Why You Should Calibrate Your iPhone Battery

Calibrating your iPhone battery (also referred to as resetting an iPhone battery) is a surprisingly important part of iPhone maintenance. Unfortunately, many people don’t realize its benefits, and even fewer take the time to perform the necessary steps.

Without a correctly calibrated battery, you’re likely to experience inaccurate and erratic battery percentage readings, quicker battery drain, and a shorter total lifespan for your battery. If your iPhone shuts down unexpectedly when your battery life percentage hits single digits, poor calibration is almost certainly to blame.


Many factors can cause a battery to become incorrectly calibrated. Software updates, background apps refreshing, new features, and even plain old day-to-day use can all cause discrepancies. And even if you haven’t noticed an incorrect calibration, performing the steps below will ensure all the ions in the battery are flowing, thus improving the battery’s peak performance.

While you shouldn’t need to calibrate regularly, it’s worth a try if your iPhone is older or you’ve had battery issues that other steps didn’t resolve.

Preparing to Calibrate an iPhone Battery

Before starting the calibration process, there are a few steps you should take in preparation. They all revolve around disabling features and services, so as few tasks as possible draw power.

This will help lead to an accurate reading later in the process. After you’ve reset the battery, you can re-enable all of these options. It’s also worth ensuring you haven’t accidentally enabled Low Power mode by going to Settings > Battery.


Disable Location Services

To disable location services on your iPhone, follow these steps:

  1. Open the Settings app.
  2. Scroll down and tap on Privacy.
  3. Select Location Services.
  4. Slide the toggle next to Location Services into the Off position.

Remember, you can use location services to track a lost iPhone, so make sure you don’t forget to re-enable this after you’re done calibrating.

Disable Background Refresh

Follow the instructions below to turn off the background app refresh:

  1. Open the Settings app.
  2. Tap on General.
  3. Select Background App Refresh.
  4. Tap on Background App Refresh a second time.
  5. Select Off.

Decrease Your Screen Brightness

Here’s how to lower the screen brightness on an iPhone:

  1. Open the Settings app.
  2. Scroll down and select Display & Brightness.
  3. Move the Brightness slider all the way to the left.

Turn Off Automatic Updates

Finally, to turn off automatic updates, follow these three steps:

  1. Open the Settings app.
  2. Scroll down and tap on App Store.
  3. Slide the toggle next to App Updates into the Off position.

How to Calibrate an iPhone Battery

Now you’re ready to calibrate the battery on your iPhone. Be warned that it takes quite a bit of patience; you’ll need to wait around for a couple of complete charge/drain cycles to finish.

Luckily, you don’t need any third-party tools or apps. Anything you see in the App Store professing to reset your iPhone battery is at best unnecessary and at worst a scam. iPhone battery calibration is easy to perform without extra help.

Step 1: Drain the Battery

The first step is to completely drain your iPhone battery. You can do so during normal usage. If you want to speed up the process, you can play a long video on YouTube with the volume turned up to the maximum level.

Step 2: Wait Three Hours

You may have noticed that your iPhone will automatically shut down even if the battery has a small percentage left. This process is by design; it gives the device a chance to save the current state of your apps so you don’t lose data.

It’s important to let the last embers of the battery life die away. The only way to do this is to wait. Longer is better, but you should wait at least three hours. If you have time, letting it sit overnight is preferable.

Step 3: Charge Your Device

Now it’s time to refill the battery. To ensure optimal performance, make sure you follow these tips:

  • Use a wall socket rather than a computer to charge.
  • Ideally, use an official Apple charger. At the very least, make sure you use a trusted Lightning cable and not a cheap knockoff.
  • Continue to charge for a couple of hours even after your phone shows the battery as 100 percent full. You need to ensure you squeeze in every drop of power to ensure the calibration works correctly.

Step 4: Drain Your Device

Now you need to repeat the whole process a second time. It’s the same drill as before: completely drain the power out of your device. Either use it as you normally would, or play videos on loop to move it along faster.

Step 5: Wait Another Three Hours

It’s getting repetitive by now, but stick with it. Once again, you need to ensure you drain that last bit of battery power from your iPhone. Like before, the longer you can leave it, the better.

Step 6: Charge Your Device

To finish the process, you need to recharge your device. Follow the same guidelines as earlier, ensuring you let your phone continue charging for a couple of hours even after it’s full.

Finally, you need to re-enable the services and functions you disabled earlier. Turn Location Services, Background Refresh, and Automatic Updates back on and turn the screen brightness back up.

And that’s it. Now your iPhone battery has been recalibrated.

Other Battery-Saving iPhone Tips

If recalibration hasn’t fixed your iPhone battery problems, it might be time to spend some money on a new battery. You can change the battery yourself if you’re feeling confident, but doing so will void your phone’s warranty.

Alternatively, head to Apple’s Battery Service page to schedule an appointment. A new battery and the required labor aren’t as expensive as you might think.

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