iPhone 4s battery died - NO WARNING
So, my iPhone 4 used to give me a warning at 20% and 10% battery left.
My iPhone 4S has now just quit on me twice - no warning at all. Battery indicator goes to red and then several minutes (15?) later, the phone shuts down completely and says I have to plug in.
What's going on?
Battery life is less than 2/3rds what the iPhone 4 was. I've disabled all the obvious things - location svcs, notifications, etc. Still, battery life is HORRIBLE.
Any suggestions?
iPhone 4, iOS 5