Thank you. I have already done all you suggested. I took the phone to the shop today and they took a good look and couldn't see anything running that would be causing this and suggest it is the battery itself that is the problem. As I've only had the phone for 6 months surely this shouldn't be the case? The shop do not sell batteries so could not replace it for me.
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There are a few features that may improve your battery life by turning them off. I would suggest turning off bluetooth, wifi when your not using it, switching to 2G networks when you do not require intensive data, turning off sync on your phone and turning off GPS. Also reducing your screen brightness will help improve your battery life as the screen is probably the biggest drain on a phone battery. I hope all this information helps.
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