To see how much battery power you have left on the iPad, you must first enable it in settings before it can be displayed on the screen. Once it is displayed on the screen it will appears with a battery icon and it will show much much battery you have left in percentage. Here's how:
1. Go to the Home Screen.
2. Tap on Settings.
3. Then tap on General.
4. Select Usage.
5. Now you can set the Show Battery Usage to On.
The battery icon now should appear on the top right hand corner of the screen.
Additionally, while in the Usage screen you could see cellular network data usage or you could reset the data usage statistic.