How do I increase my battery life
How do I increase my battery life
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Charge your iPhone when possible, don’t make a habit of letting your charge level get too low, and turn on Optimize Battery Charging. And above all, don’t stress about it. Just use and enjoy your iPhone. You could actively do all sorts of stuff to make your battery last longer. In the end, all of that might add another month or two to the lifespan of your iPhone.
See iPhone Battery and Performance - Apple Support