How to Extend the iPad mini’s Battery Life
Here are some ways that you can extend your iPad mini’s battery life. First and foremost: If you use a carrying case, charging the iPad while it’s in that case may generate more heat than is healthy. Overheating is bad for both battery capacity and battery life. So take the iPad out of the case before you charge it.
The Smart Cover isn’t actually a case, so if you use one of those, you’re good to go.
If you’re not using power-thirsty 3G, 4G, or Wi-Fi networks, or a Bluetooth device (such as a headset), consider turning off the features you don’t need in Settings. Doing so could mean the difference between running out of juice and seeing the end of a movie.
Activate Auto-Brightness to enable the screen brightness to adjust based on current lighting conditions. Using this setting can be easier on your battery. Tap Settings-->Brightness, and then tap the On/Off switch, if necessary, to turn it on.
Turn off Location Services (tap Settings-->Location Services) globally or for individual apps with the On/Off switches. Figuring out your precise location takes its toll on your battery, so you may want to disable Location Services for apps you don’t use very often.
Push notifications are notorious juice-suckers as well. Disable them (tap Settings-->Mail, Contacts, Calendars-->Fetch New Data-->Push On/Off switch) and watch your battery life improve dramatically. You can disable push notifications for other apps via Settings-->Notifications.