13 Power Your iPhone Off Regularly
You shouldn’t let your iPhone battery completely drain between charges. That’s largely a debunked myth at this point. On the other hand, you should make a habit of powering off your device regularly — and leaving it off.
Apple Genius Bar staff recommends turning off your phone at least once a week for a period of a few hours. The result, they say, will be slightly increased battery life. Plus, it’s probably healthy to have a “smartphone-free” time, anyway.