iPod New iPod classic battery problem?

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Hi. Yesterday I bought brand new iPod classic 160GB (late 2009 model). When I came home I charge it for 5 hours (and sync my 14GB music collection). After 5 hours of charging, battery indicated that it's full and I eject and disconnect it. BTW I charged it via USB 2.0 Mac mini port (Mac mini is also late 2009 model).

So yesterday I didn't have much time so I use iPod just about 1 hour (more like 45 minutes) and battery now indicates that only about 30% of juice has left. This seems to me a bit weak battery life even for first charging.

Is anything wrong with my iPod? SRY for bad english.

PS: all my music is 320bits/s and I have EQ off.

 

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I've solved battery problem. It seems like the problem was calibration or just first charging.

Anyway. I have now new problem with scroll whell. Whell is on one side (where Next and Menu buttons are) about 1mm higher in comparison with aluminium body and on the other side fits perfectly. Also Next button is a little harder to push than other. Is this usually?