So I've had my Iphone 5 for a year now and never had any issues with the battery. It usually lasts me 2-3 days on a proper charge. Since yesterday for some reason the battery has been draining out extremely quick with me doing very little on it. I started the day with a full charge and that usually takes me like I said 2-3 days but it was dead before the day was up. I recharged it again last night to a full charge at 100 % and powered the phone off and back on again , I unplugged it this morning,and didn't touch it for an hour and it's already at 91% without doing ANYTHING. I dont know what's draining the battery. All the usual stuff is off, Wi-Fi, bluetooth, etc No icons at the top including location services including that anything extra is running. I shut down all the background apps last night before I recharged it yet the same problem. Anyone have advice on what it may be ??