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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.