So I have looked in the forums and haven't seen anything like this. I have the 60gb video iPod and for some reason the battery meter is all off. I think I have figured out that after about 10 hours or so (half the battery life) it will show it as being on its last bit of red. But it will continue to run for another 10 hours or so before shutting off. If I use it for however long and then plug it in to charge and then immediatly unplug it it will show its true battery life. I have tried callibrating it several times and nothing works...
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iPod Weird iPod Battery Issue
- Thread starter greenguy4
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You calibrated it by completely discharging it then completely recharging it? Sorry for asking a stupid question but aside from calibrating it and perhaps reinstalling the firmware, I can't think of a fix. 
i've experienced it being off (it would show it's halfway full or whatever and then shut off saying no battery left) but not fluctuating like this. If you have reinstalled the firmware and calibrated the battery, try looking on Apple's support page if you haven't already. They have a lot of people post there with their problems...greenguy4 said:
If no such luck, just bring it to an Apple Store and they'll fix it. (edit: I did this while it was still in original warranty and was given a new replacement).