If it seems like your iPhone battery is draining more quickly than it should, it’s easy to check if there’s a problem with your phone. Head into your Settings app, tap on General, then Usage, and you’ll find two numbers. Usage is how long you’ve actually used your device for, and Standby is how long it’s been since you last charged your phone. Unless you’ve been using your phone non-stop since you unplugged it, your Usage time should be much lower than your Standby time. To see if you have a battery issue, write down your usage and standby times, then turn off your iPhone’s screen and set it down. After five minutes, check the numbers again. If your phone is working normally, your Standby time should have gone up by 5 minutes, but there should be little to no change in your Usage time. If that number goes up by more than a minute, you’ve got a problem – and a trip to the Genius Bar should be in order.