Battery drain on iphone4s (runs out)

My battery on my iphone4s won't last more than 10 hours. I take it off charge at 7am and it will always die before 5pm.
I have never got it to last more than a full day. I only use it to text afew times a day. I have tried turning all apps, settings, brightness, location, wifi, bluetooth off but still will NEVER last a day. I've tried update and resotre but still have the same issues. Deleted apps, turning off icould stream, turning of calendars (sync) but still no joy.
My friend has an iphone4s and on the way home from work at 4pm my battery is on 7% and his is sometimes on 90%. I got the phone pretty much when it just came out.
Can anyone please identify the problem?
Thanks people, I am hopeful someone will help me.

I started to have this problem after upgrading from 8.0 to 8.0.2.  I went to a local Apple Store and talked to those "Geniuses".  They definitely knew this problem.  They did some tests and then told me that the battery works great.  They said the problem was due to some software issues, for example, some old apps.  I was told to do a fresh install of iOS and reset all settings to the default factory settings.  They also told me that iOS 8.1 would come out very soon and it would fix the issue. I left that store and then tried the solution. Of course, it did not work.  I reset my phone, set it up as a new phone, and did not install any apps. I even turned on the Airplane mode. Still, the power drained from 100% to ~12% after one night's standby.
I also tried iOS 8.1. The newer version is even worse!  First, it seems that the battery drains even faster.  Second, the phone becomes pretty hot (50-60 Celsius) even with normal daily use like email, web-browsing, and calls.  The worst part is on the side of the phone:  I could not even hold it for very long time.
I had an on-line chat with Apple support.  Again, they told me that the hardware has no problem.  They also deny that iOS 8 is the cause of the problem.  They just told me to do a fresh install again!  BTW, I asked if they could help me to downgrade the iOS to 7.1.2.  The answer is no.  Once you have upgraded, Apple does allow you to go back. To sum up, Apple knows the problem.  But they do not admit it and of course, will not fix it.

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