ver 1.2 : You can see the battery level of the drone and of the remote control - but not of the Crystal Sky tablet.
Although you do get a 15% warning, I'd prefer to change the battery before take-off had i know it was that low.
The battery level is not something the user should see all the time in the top bar, as on normal android device the battery i indicated in the Android OS top bar. For CS showing the battery level can be convenient to the user but will also take space away from the telemetry bar.
As a compromise, we shall add the Android device battery level to the drone connection status dialog.