My iphone 3gs battery drains very fast

my iphone 3gs battery drains very fast it won't last for whole day
i just uses mail application and facebook for some time
can u tell why the problem is or need to change battery

I'm having the same problem with my 3Gs. In my case it is not the apps int he background or the brightness, or wifi or email push. The folks at the apple stroe tell me that there is some software glitch that shows up every few months.
I can only get rid of it by restoring my phone as a new device. In which case I lose all of my contacts, settings and all data. VERY frustrating. I had recived two new phones (before applecare ran out) and have done the resotre several times. No one can tell me what is in that creates this probelm. I've tried differenet chargers one by one in case they are the probelm. one int he car, one in a kitchen outlet, one at my home computer (sync) and on at my office computer (non-sync).
Problem just showed up again randomly two days ago, no new apps or hardware. battery drains from full to 0 in two hours.
Apple, please fix.

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Please use the search box at the upper right hand corner of this page. Your issue has been addressed ad nauseum and there is no need for yet another repetitive post.
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http://www.care4pcs.co.uk/2012/10/how-to-be-happy-gmail-user-on-iphone-or.html
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• Click Likes to appreciate those who helps you
• If your issue solved, mark the best post in your thread as Solution

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See item 3 Here > Community etiquette

My iphone 3gs battery drains very fast

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