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Disable unnecessary vibrations
Vibrations are useful to enable, particularly when you're working in loud environments — or even very quiet ones — so you can leave your iPhone on silent and receive a buzz in your pocket when a new message or notification arrives. A physical motor spinning in your device causes these vibrations, but this uses up precious battery life. These can be restricted, or disabled altogether.
Go to Settings > Sounds and select whether you want to enable vibration when your phone rings, or if you want it enabled while it is set to silent.
Regularly close unused or dormant apps
Some iPhone apps don't completely close when they're no longer being used. Instead, they lie dormant in the background. When using memory- or battery-intensive applications, these are still churning up power in the background. It's suggested that when you no longer need to use an app, close it down completely.
In an unlocked state, double-press the Home button on your iPhone, and swipe up on any open app to close it. You can then return to your device by pressing the Home button again, or tapping the very first "card."
Check for iOS updates regularly for unfixable bugs
In some cases, software bugs have led to complaints that battery life decreases quicker than normal. These bugs occasionally work their way into Apple's iOS, the software that runs on iPhones and iPads, but can often be fixed with a software update.
Normally, iPhone users are notified automatically when an update is available, and the change log will note if any bugs persist, particularly those relating to battery life. To manually check, head to Settings > General and then Software Update. Make sure you're connected to a Wi-Fi network before downloading anything to save money on your data plan.