Don’t Use Your iPhone While It’s Charging
Something else that can age your battery more quickly is using your iPhone while it’s charging. This can needlessly generate even more heat, causing your iPhone’s battery to age prematurely, and could even damage it permanently.
While you don’t need to worry about picking up your iPhone to send a quick text message or check your email, if you want to use your iPhone for a more extended time or you plan to load up more demanding apps like games, you’re better off unplugging it first.