Iphone 4s battery draining very fast and phone getting hot - downloaded ios 6 about 2 weeks back

my iphone 4S gets discharged in few hours - started doing this 2 days back
I downloaded ios6 about 2 weeks back
Phone getting hot too
battery drains even without using the phone- and phone becomes hot
have tried turning it completely off and restarting it but still battery draining problem persists
please guide

I final piece for me in the jigsaw following on from this
http://www.care4pcs.co.uk/2012/10/how-to-be-happy-gmail-user-on-iphone-or.html 
is to turn off wifi when you do not need it. When I leave the house I turn off wifi, because the majority of the times when my iPhone has got very hot and crashed is when I am away from home. I suspect that if the iPhone is in the vicinity of public wifi (wheather secure or not secure) it will try and connect, even if you have 'automatically join known networks' set to off. This is easy of course if you have an unlimited data contract for your iPhone. I may be wrong, but it is working for me. It makes sense for me because it is another way of reducing the work the processor (and battery) has to do and therefore reduces the chance of overheating.
Having said that, I never had this problem with my iPhone 4. I now have a 4S.
Try it. Hope it works for you.

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