Can't get battery status of bluetooth gamepads on Android

[Wohlstand]

Recently I made a small test with SDL_JoystickCurrentPowerLevel() that should report the battery status of a wireless game controller.

• On Linux Mint it works with a PS4 controller via Bluetooth (I haven't tested the Xbox controller I had, because my Bluetooth dongle won't detect it).
• On Android, both controllers were working via Bluetooth but won't return the battery status (reports the unknown status).

Are there some challenges against implementing this ability, or here is a bug?

[AntTheAlchemist]

On Windows 10 my Xbox One S controller was reporting "Unknown" at first but then later reported "Medium" after some time.

I can confirm that battery isn't reported via Bluetooth Android. Touchpads & sensors don't work either, which might be problem related to something lost in translation when using Bluetooth.

[slouken]

As far as I know, Android doesn't expose the battery status.