See which apps taking up the most battery.
Settings ⇒ Battery
iPad Battery Saving Tips
Reduce Brightness
Turn off Bluetooth.
Settings > General > Background App Refresh: Some apps, if you allow them, refresh their content when you aren't using them so that when you return to them, you are served fresh content, saving you from needing to pull down to refresh. Background refresh is certainly convenient, but it is also a drain on battery life
Settings > Privacy > Location Services to adjust which apps are requesting your location
Settings > Notifications and choose which apps can push notifications your way
Settings > Wallpaper select stills - not dynamic
Settings > General > Accessibility > Reduce Motion switch Parallax effect OFF. No need to have a cool 3d look on your home screen