Battery indicator is faulty after iOS 7 update
The battery life on my 4S was acceptable prior to updating to iOS 7, and the battery indicator functioned properly. Since the update, one or a combination of these three things happens routinely:
1) The battery indicator shows a battery charge of 35+ percent, then spontaneously dies;
2) The battery indicator shows a charge of 1-3%, and stays there for much longer than it should while I'm using the phone;
3) The battery indicator shows a healthy charge, the phone spontaneously dies, I fire it up again, see the "charge phone" graphic, then a few minutes later it starts up and shows the same level of battery life.
The battery indicator seems to have been rendered useless by iOS 7. What's the solution here?
iPhone 4S, iOS 7.0.1