Sorry I didn't notice that this thread had some recent entries. Betty, if I were you I'd return my new Nook to B&N right away and get a new one, before your 14 days is up.
It is hard to tell why your new Nook right from the store had almost no charge. I've had 4 - a Classic, a Color, and the 2 Touches (the 2nd replacing the first), and in each case they were pretty highly charged when I first got them. Regardless, your Nook seems to be exhibiting the same symptoms I've been reporting (or even worse problems like azazel is having).
In a way, you're lucky the problems are showing up so early, when you can do something about it (i.e. exchange it for a new one). If you wait, yes, your warrantee will cover you, but you'll then have to MAIL the damn Nook back to B&N (they won't take it at the store - I've been all thru this myself), and you'll get a refurbished Nook, not a new one.
I'm sure they'll do the exchange at the store, as long as it is within the 14 day period.