Battery life sudden drop off!

Hi all i have had my iphone4 for about 3 months with no problems at all! in fact it been great. But i charged it up last night as normal and went out for the day and notice that the battery was going flat very fast?
I was not useing the phone at all as i was busy and only check it for emails ect nothing unnormal.
I went out at 10.30 and it was flat by 4pm and i mean dead!I charged it again and its now been off charge for 2hrs and is at 60% already.
I had a 3gs before this (my wife has it now) and it is still as good as new and thats a year old or more.
Has the battery had it? if so why?
PLEASE HELP LOL
Regards
Andy

I have a similar symptom to the original post, and have tried the reboot suggestions, but they didn't work. I have had the phone for a month or so, replacing a 2G, and initially battery life was about the same. The battery will not last even for a day. When I went to bed last night, the phone had 70% charge and it was completely dead by the morning today.
To diagnose a separate issue (data use increased 5x to 10x on both my phone and my wife's 3G iPhone after changing to the 200MB/mo plan), I started shutting down potential data users: no push, no fetch, no notifications, made sure apps were not running in the background, etc. It doesn't seem to make sense, but I would say that battery life got worse.
My question: is there any utility or available to check or log what's going on in the phone?
Thanks!

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Model Information:
Manufacturer:          Sony
Device Name:          ASMB012
Pack Lot Code:          1
PCB Lot Code:          0
Firmware Version:          110
Hardware Revision:          500
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Fully Charged:          Yes
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Condition:          Service Battery
Battery Installed:          Yes
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Battery life sudden drop off!

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