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Reduce auto-lock period to switch off backlight
Reducing how long it takes for your iPhone to switch its display off can help to considerably conserve battery life. When the smartphone is put down on a table, for example, it can take a minute or two — perhaps even longer — for the display to turn off. This means the display can quietly eat away at the device's battery life while it's not actively being used.
Go to Settings > General > Auto-Lock, then set this to 1 Minute or 2 Minutes, depending on your preferences. The shorter the time period, the greater the benefits to your iPhone's battery life.
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."