Hi, I'm having some trouble with my 4s battery. It'll be on 100% with no apps open etc and randomly jump to 80% etc, just huge drops down. Just now I was on 57%, opened Facebook and within seconds was on 16%. My iPhone will also turn off at random points under about 60% saying low battery. I plug it in and the battery is in fact still at the same point it was before it switched off. This is not just me, I can count 6 or 7 friends with the same problem. It's very annoying and was wondering if there is any solutions. I've tried things like keeping apps closed, location settings etc. Not good when you're waiting on a call and it randomly turns off for absolutely no reason.