Article: Apple recommends updating regularly because engineers look for new ways to optimize battery performance, and incorporate these features with new iOS software updates. If you're not sure how to update your iOS, make sure to check out this article for detailed instructions. Apps with lots of graphic detail and 3D visuals drain your battery faster than anything. Make sure to fully close apps running in the background to save your battery. Extremely high or low temperatures can cause your battery life to decrease. Keep the iPad environment between 32ºF and 95ºF(0ºC and 35ºC). Be careful with using an iPad case when charging the battery. A bad case can prevent adequate ventilation during charging, and increase the iPad's temperature, potentially damaging the battery. It's a quick and convenient way to disable all of the iPad's wireless features like cellular data, Wi-Fi, GPS, and location services to save up on your battery life.  Airplane Mode will also prevent you from making or receiving phone calls since it disables all cellular service. If you're not sure how to switch to Airplane Mode, make sure to check out this article for instructions.

What is a summary?
Keep your iPad's software up-to-date. Avoid frequent use of 3D or graphic heavy apps. Keep the iPad away from extreme temperatures. Switch on the Airplane Mode when you don't need any connections.