Damian is 10 and has an iPhone 4S, but the battery dies in about 3 hours. Leo says that's largely because Damian plays with it a lot. He also noticed that the phone crashes after overheating. Could there be something wrong with it? Leo says there probably is. He advises taking it to the Apple Store. They'll replace it if it's still under warranty. To preserve the battery life, he should turn down the brightness, turn off bluetooth, and check email manually.