Ever since Friday, the battery life on my 5S has become nearly useless. If I'm out of the house for longer than 4 hours the thing is nearly dead and it's a phone I had replaced a little over a month ago by the Genius Bar. I upgraded to 9.1 a few days before Friday but it's been constant through the weekend with the phone running very hot and the battery stats registering programs that run in the background for 20 minutes as a cause of the drop. Even low power mode means I'm losing 1% per 10 minutes on standby. Anyone have any ideas?