Calibrating the battery: This is how it works with Android smartphones

Calibrating the battery: This is how it works with Android smartphones

If the battery indicator on the smartphone no longer shows the correct charge level, you need to calibrate the battery. It's very easy, but it takes some time. We explain what to do.

The battery is one of the most important components of every smartphone, because it determines how long you can use the device every day. But modern lithium-ion batteries do not always behave as users or software developers would like.

Especially after prolonged use, it can happen that the charge indicator on the smartphone no longer correctly shows the true charge level of the battery. Sometimes a smartphone switches off even though the battery level was previously displayed at 10 or 15 percent. To prevent or remedy this, the battery must be calibrated.

Why you need to calibrate a cell phone battery

A chemical process takes place inside a lithium-ion battery during both charging and discharging. This cannot be measured precisely by the smartphone's internal sensors. The smartphone software can only learn the charge level of the battery using two parameters: when it is 100 percent charged and when it has been completely discharged. All charging levels in between are calculated by the software based on capacity and usage behavior.

Since the performance of a lithium-ion battery decreases over time, it is possible that the actual and the displayed charge level no longer exactly match after a large number of charging processes. It can happen that the smartphone suddenly runs out of juice, although the display had previously shown a remaining charge of several percent.

Calibrate smartphone battery: this is how it's done

  1. First of all, you have to completely empty the battery once. So wait until the battery is empty and the phone switches off. Then try to start the device again and wait for it to shut down again. This is important because even after the first switch-off there is almost always a certain residual charge.
  2. Leave the phone switched off and charge it to 100 percent via cable. Do not unplug the device before the battery is fully charged.
  3. After the device is fully charged, first remove the charging plug and then restart the device. If the battery indicator does not show 100 percent, plug the cable back in and fully charge the device. Then unplug the cable again and restart the smartphone.
  4. This allows the software to automatically recalibrate the battery gauge based on the actual charge status. The displayed and the actual battery capacity should then be largely synchronized again.

Do not calibrate the battery unnecessarily!

You should only calibrate the smartphone battery if you have really determined that the battery indicator no longer correctly shows the charge level. Otherwise, you should avoid completely discharging the battery if possible, because this will have the greatest impact on its service life.


  1. The performance of lithium-ion batteries decreases over time, so that the battery indicator no longer shows the correct charge level after a few years.
  2. To fix this condition, you can recalibrate the battery.
  3. To do this, discharge the device completely and make sure that the battery does not contain any residual charge.
  4. Then fully charge the smartphone once when it is switched off, then unplug the cable and restart the device.

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