Getting the Most iPhone Battery Life

You can quickly change the time until your iPhone locks to save some battery life. By default, your iPhone display will go to sleep and lock after 1 minute.

You can decrease this time to 30 seconds to help save some battery life.

If you don’t touch your phone for thirty seconds, the display will go to sleep and your phone will lock. Going from one minute to thirty seconds doesn’t seem like it will make a huge difference but those thirty extra seconds gained of the display being on can add up quickly to savings on your battery.

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Settings > General > Auto-lock