Low battery charge life?

I bought an iPhone4 a couple of weeks ago and though obviously busy on it initially I recently noticed, with more 'normal' use, how quickly the battery runs down. As a test I've had wi-fi/networks off for a couple of days and generally it's 'sleeping' a lot but, for example, it"s lost 35% of its charge in 6 hours since fully charged.
What should the 'average' charge life be? Surely more than that?
Oh, and I see no-one has any ideas about my Youtube question in this topics list...?

It all depends on what you do on your iphone during those 6 hours. But it sounds about right. None of the 4 gen iphones I've owned have been able to keep a charge for an entire day without having to recharge it at work or in my car. I do use it for everything- music, games, surf the net, etc... It's a downside to all smart phones and the iphone is not an exception.
~R

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