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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.
Be aware of where you put your iPhone
Almost above all else, keep your iPhone and its internal battery within the operating range, so that it doesn't get too hot or too cold. An iPhone will generate heat depending on what it is being used for, so keeping it at a level temperature is important.
The warmer your iPhone gets, the faster the battery will deplete. Sometimes it's better to keep your iPhone out of your pocket and carry it in your bag — carefully, to ensure the screen or case doesn't get knocked about or damaged — or even clipped to your belt. Some cases will also result in the device getting warm, so choose your accessories and cases carefully.