You need to be rooted and have TWRP recovery installed on your device to use this feature.

First you need to choose where apps will be restored:

• Internal memory (the default)
• System (only available up-to Android 9, beyond that version, system is read only)

Next you need to specify an option to prepare files for restore:

• Post-boot APK installation and data restore.
  • Compatible with Android up-to 12 (maybe 13)
  • Tested on a Galaxy S7 running Android 12.
• Direct APK installation and post-boot data restore.
  • Compatible with Android 14 and above.
  • Tested on a OnePlus 9 Pro running Android 14.

Note that results may vary depending on Android variant and manufacturer.

You can select both options, but the resulting ZIP will be twice as big to be compatible with most versions of Android.

Considering TWRP becomes less and less available, it is very complicated to test all Android versions and devices. Should you use that feature, don’t hesitate to report your findings sending a request from app’s settings, help and support.

NB: If you believe your kernel supports voltage control but the app is not recognizing it, please send a support request from the app settings. Don’t forget to specify the issue within the request to get noticed.

For example using a 1500mAh capacity battery, a 1% change over one hour = 15mA. a 2% change over 30 minutes = 60mA, a 1% change in 5 minutes = 180mA.

When % is not changing the estimated mA is updated according to the last value.

If current mA = 60mA, and % remains unchanged for 30 minutes, this means current mA <= 30mA, hence the estimated mA is updated accordingly.

Please check how accurate estimated mA is.

First, it’s important to differentiate the 2 types of phones:

• Phones providing real mA measures
• Phones not providing mA measures while charging (main screen shows “Estimated: xx mA” while charging)

The first category of phones, with real mA measures, will calculate real battery capacity mAh no matter how the app is configured.

The second category requires special attention and the app need to be configured in this way:

• A battery profile must be created with the manufacturer’s specified battery capacity (mAh) and the AC charger output power or
• The in-use capacity must be set to the manufacturer’s specs
• The AC charger output power must be set matching charger’s specs.

The app will then use 3 simple facts to determine the real battery capacity:

• Charging can’t go over the charger output power (frequently 1000mA).
• From 0% to 50%, phone uses the maximum charger capacity.
• Above 50% charging rate is lowered to protect battery from aging faster.

If the charging consistently goes over the charger power, it means the defined mAh is over-estimated and the app will adjust the results accordingly.

If the charging consistenly stays lower than charger power while screen is off, it means the defined mAh is under-estimated and the app will adjust the results accordingly.

So it’s important to set the original battery capacity when using extended battery as it is easier to adjust over-estimated values than adjust under-estimated because the later requires the screen to be switched off. While screen is on charging is always lower than charger power hence the need to have the screen off.

Whether the battery capacity is set to 2000mAh or 20.000mAh the app will easily discover a lower battery capacity because the charging (mA) will consistently be above actual charging power between 0% and 50%.

Here is a way to correlate the results: Charging times increase with battery capacity, eg a 3500mAh battery must take longer to charge than a 2100mAh battery.