If you’re just playing an offline game, toggle on Airplane Mode in the Control Center to turn off all your radios. No need to keep it turned on all the time. Multitasking is much improved in iOS 7, but that comes at the cost of system resources. Luckily, you can pick and choose which applications are allowed to refresh content in the background. General you’ll find the Background App Refresh button. From here, you can toggle each multitasking app, or you can simply turn off this functionality completely. Spotlight has to frequently index the files on your device, so it can really start to chug if you have a lot of flash storage. If you don’t mind losing the search function, you can simply disable Spotlight indexing completely. Mind you, you do have granular control here, so you can disable only selected data types if you so choose. The Raise to Speak feature of Siri can be useful, but it does require the proximity sensor to work overtime. If you’re okay with using the simple press-and-hold function instead, this can be toggled off under the Siri menu in the general section of the settings app.
Some apps, again especially Facebook, have been accused of cheating on background access, however, so you might also need to try other mitigations. That can include "force quitting" an app you think has gone rogue and begun consuming way to much power. Double click the Home button (or 3D Touch press the left side of the screen on iPhone 6s) to bring up the fast app switcher. Swipe to the app you want to force quit. Touch the app card and flick it up and off the screen. I'll confess to force-quitting Facebook and Skype semi-regularly. That's because, historically, they've been offensively bad at power management. I used to force-quit Maps and Google Maps after turn-by-turn navigation but they've both gotten much better at powering down over the last year or two. If you can't figure out exactly which app or service is draining your battery but you feel like something isn't working the way it should be, you can escalate to full-on reset.
Again, it's not something you should do often, and it's a total troubleshooting cliche, but once in a while it really can clean out bad bits and knock things back into shape. Press and hold down the On/Off button on the right side (iPhone 6 or later) or top (all other iPhones, iPods, and iPads). Press and hold down the Home button on the front of your iPhone, iPod touch, or iPad while still holding down the On/Off button. Keep holding both buttons as the screen turns off keep holding both buttons until the turns back on again and displays the Apple logo. Silver, gold, and rose devices will show a white screen with black Apple logo. Space gray devices will show a black screen with white Apple logo. Uninstall the app and use the website, if there is one. Uninstall the app and only re-install it when you need to. For example, delete Skype and only re-download it when you know you need to make or take a Skype call. Hopefully bad apps will clean up their acts, and every update is a chance for them to do better. So if you do delete, make sure to check back every once and a while, and see if things have improved! If you think you have something unusual going on that might be adversely affecting your battery life, here's more help! Battery life problems with iOS 9,
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