Paranoid about the battery

Ok, I got my nano today and I have fallen in LOVE with it. Just wondered about the battery though. I got it out of the box, choved it on my Mac and away i went! It said it was fully charged after like an hour though - not even that? I took it out anyway, was I right to do that? Anyway, I was just thinking about this '12 hour battery life' thing, when are you likely to get this 12 hours? At a medium volume setting with minimum backlight etc?
I just think the battery will go down a lot quicker (all of my friends iPods have *not so good* batteries so didn't want this to be a continuing problem)
Thanks anyway
ijmac

I'm scared now though, this morning it said battery was empty and I needed to recharge, when recharging it didn't take 3 hours (I don't think) to recharge fully, it took less (maybe 2?)
Also, when just unplugging the charged iPod the battery icon went down a bit? When i first got my nano, i charged it for like an hour (until it said fully charged), then as the icon went to half way, shoved it i again, soon after than i unplugged it to let it go all the way down to charge fully (as people recommend)
Please don't say I've buggered up this wicked iPod =(

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