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Published 13:54 14 Oct 2015 BST
Updated 13:54 14 Oct 2015 BST

Switching this on stops your phone lighting up when you get a message and basically cuts out any visual effects, allowing your battery to last longer.
This is an option available to people using iOS9 and turning it on is easy - simply select Settings, then Battery, then Low Power Mode and hopefully you'll see a noticeable difference in the life of your iPhone battery. Magic!Explore more on these topics:

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