1. Turn Wi-Fi Auto-Search To Off
As something of an extension to the first tip, you can also prevent your device from searching for networks all the time, which is not only unnecessary – you can toggle it on via the Control Center when you do wish to connect to a hotspot – but also a strain on the battery.
Go to Settings > Wi-Fi > Ask to Join Networks and toggle to OFF.
2. See Which Apps Are Using The Most Battery
In iOS 8, Apple has made it possible for users to check battery use on an app-by-app basis. Thus, by navigating through Settings > General > Usage > Battery Usage, you can quickly determine which apps are using your battery up the most, and either use them less, or even delete them altogether.
3. Turn off Parallax
The Parallax feature first rolled out with iOS 7, and as well as proving a bit of a headache in the literal sense for some users initially, also warrants additional battery. To disable it, go Settings > General > Accessibility > Reduce Motion, and toggle to ON.
4. Disable Background App Updates
Apps automatically updating to the latest version is seamless and all, but if you’re out and about and worried about keeping your device alive, having the latest version of Facebook installed becomes somewhat less important. To save battery, go to Settings > iTunes & App Store, and at the bottom, simply toggle Updates to OFF under Automatic Downloads.
5. Stop Backgrounded Apps From Refreshing
The great thing about disabling Background App Refresh is that it’s not all or nothing, so by going to Settings > General > Background App Refresh, you can pick and choose which you want to continue refreshing and which you’d like to kill off.
6. Location Services
Many apps unjustifiably ask to see your location, which is not only quite invasive, but when an app uses location services, it also dips into your battery life.
If you’re using, say, a navigation app, then obviously, Location Services are a must, but if not, Settings > Privacy > Location Services and remove those that you don’t feel need to know where you are.
7. Turn Off 4G LTE
It may be lightning quick, but 4G LTE is a battery hog, and if it’s not especially critical that you’re running a super-snappy connection, consider disabling 4G by going to Settings > Cellular > Enable LTE.
8. Disable Auto-Brightness & Dim Your Display
Auto-Brightness is self-explanatory in that it automatically brightens up your display, but the trade-off, as with many useful iOS 8 features, is that more battery is used than necessary.
In Settings > Display & Brightness, you can disable auto-brightness, and if you also turn the brightness down lower – as low as you can manage without it adversely affecting the experience – then you’ll save even more battery.
9. Disable Push Notifications For Certain Apps
Sure, being notified of that @mention or Facebook ‘Like’ is the be-all and end-all, but if you get any apps sending you push notifications that you tend to ignore, then head to Settings > Notifications, and under Include, toggle away.
10. Use Airplane Mode More
Although its probably critical that your iPhone is kept online at all times for obvious reasons, your iPad or iPod touch doesn’t need to be online when you’re, say, reading a book or watching a movie already downloaded to your device.
Airplane Mode is easily accessible from the Settings app or Control Center, and if you get yourself into the habit of utilizing it, you’ll be amazed by the additional time that your device remains powered up.
11. Disable System Services For Location
There are some background location services which take a toll on battery life without the user being known about it. Navigate to Settings > Privacy > Location Services > System Services and toggle off Location-Based Alerts, Location-Based iAds, Spotlight Suggestions, Wi-Fi Networking and Frequent Locations.
Note: you can toggle other services off too, but that might disable features for some apps, like Share My Location for Messages.
12. Disable Automatic Time Update
iOS keeps the device’s clock updated at all times, and in doing so, it uses your location, and hence takes its toll on battery life. To disable this feature, go to Settings > General > Date & Time and turn Set Automatically to OFF.
13. Turn Off Bluetooth
Bluetooth is turned on by default in iOS 8, and it’s a feature which can take its toll on battery life if kept on for no good reason. Simply slide up Control Center, and tap the Bluetooth icon to turn it off.
14. Disable Handoff & Suggested Apps
A killer iOS feature by a long shot, but a battery drainer nonetheless. Simply navigate to Settings > General > Handoff & Suggested Apps and turn every toggle OFF in the resulting page.
15. Disable AirDrop
It sounds like an awesome feature for quickly sharing stuff between iOS users, but it can be a battery hog when left running in the background.
Simply drag up from the bottom of the display to bring up Control Center and then tap on AirDrop and then tap on Off.