iPod help needed

[DarrenMcLeod]

I recently got around to updating my 4g 20gig iPod up to version 3.1. However, since then, for some strange reason whenever the battery icon goes down to about 3/4 full, a message comes up saying "PLEASE CONNECT iPOD TO A POWER SOURCE IMMEDIATELY," and it shuts off. I'm only getting two or three hours of playback on it, and because it happened right after updating I don't think it's the battery's fault.

Can anyone offer some help?

Also, my iPod says it has 6 gigs left of room on it, yet iTunes says it only has 2.04 gigs of room left.