I got a 2nd generation 8gig refurbished touch from Apple 4 days ago. Ok - for the first few days I was using it a lot, so I expected the battery to go down fast- but it did seem to go down pretty fast, like after 2 hours - so maybe it was not fully charged.
I let it charge up last night for over 10 hours and I was using it today for taking notes, sending a few emails, no music playing, played some games for maybe 30 minutes. Mostly it was just sitting nearby, auto lock set at 5 minutes. I did not actually turn it off at any point, maybe I should.
After 3 hours the battery was down to 40%, after 4 hours its less than 20%