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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."