Why is battery so much worse on the iPhone 3G?

I've been using the old iPhone for a year. And a month ago I switched to the 3G phone. And the battery lasts around 50% compared to the old.
- 3G is off
- Email set to manual
- Brightness less than 50%
- Unlike the old phone, my iPhone 3G is not jailbroken.
I did a test some days ago: Charged the phone fully, and it said "Standby and Usage: 1 minute". The next day when i checked my phone is said standby 12 hours and usage 7 hours. Appearantly the phone was in use, when it was locked?
I'm getting really tired of this phone... The old one was much better

No genious bar in my country, only option is mailing it to a servicepoint which will probably take several weeks
Anyway, what could possibly be running? Battery has been like that since i got the phone, and i've upgraded firmware several times, now running 2.1. I restart the phone a couple of times during the week.

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