Here are some tips to make your iPad battery last longer – and make it easier to keep track of your battery.
THE BEST TIP IS
PLUG THE THING IN AT NIGHT
WHEN YOU GO TO BED!
Just make a habit of it!
Enable Low Power Mode
When your device reaches 20% battery life, iOS 9 will alert you to turn on Low Power Mode, which will turn off automatic mail fetches, background app updates, and other systemwide toggles in order to help you get a few extra hours of battery life.
Low Power Mode will remain on (though you can turn if off at any time) until the device has been charged to at least 80% battery life.
- Settings —> Battery
Enable the toggle for Low Power Mode.
The battery indicator in the status bar will turn yellow, showing that you are in Low Power Mode.
Get detailed power usage for each app
Sometimes you may want to know what apps are using the most battery life on your devices so you can tweak your usage habits whenever you’re in a low-powered environment. With iOS 9, you can see exactly what apps have been eating your battery life by following these steps.
Settings –> Battery –> Battery Usage
Select either Last 24 Hours or Last 6 Days, and then select the clock icon.
Turn off Background App Refresh
Settings –>General —> Background App Refresh
http://www.techrepublic.com/article/three-ios-9-battery-management-tricks-that-will-delight-you/