1. Lower screen brightness To adjust screen brightness, swipe up to open the Control Center and use the slider on the right to lower your screen brightness. You can also go to Settings > Display & Brightness to adjust the brightness. Also on this settings page is a toggle switch for Auto-Brightness. Unless you are frequently using your iPad at the beach or in other brightly lit environments, turn on Auto-Brightness, which adjusts the screen level based on ambient light.
2. Turn off AirDrop AirDrop lets you shuttle files among your iOS devices or between your iPhone or iPad and your Mac. It's super simple to use but, like fellow wireless technologies Bluetooth and Wi-Fi, it can also drain your battery even when you aren't transferring files. Unless you are using AirDrop to transfer files regularly, why not keep it turned off until you need to use it? To do so, swipe up for the Control Center, tap AirDrop and then tap Receiving Off.
3. Limit 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. Head to Settings > General > Background App Refresh and you can turn Background App Refresh off entirely or select which apps you'd like to refresh in the background.
4. See which apps are battery hogs On the iPad, the Battery page in settings is useful because it shows you which apps have used the most battery resources in the last 24 hours and the last seven days. If your iPad is running through battery life at a disturbingly fast pace, check here to see which apps are the cause and then quit using those apps until you can charge your iPad.
5. Quick trigger for Auto-Lock Why let an idle iPad run down your battery? With Auto-Lock, your iPad will shut down after it has been inactive for a period of time. You can set it as short as 2 minutes. To set a time period for Auto-Lock, head to Settings > Display & Brightness > Auto-Lock.
6. Stay up-to-date Apple's software updates eradicate bugs and often improve performance and battery life. Go to Settings > General > Software Update to check if an update is available for your iPad.
7. Quitting Apps Doesn’t Save Battery Life Not only does quitting apps not save any battery life, it can actually harm your battery.Resist the temptation to swipe up and quit apps.