Has anyone here had to change your battery or upgraded their nook with the mini sd card?  I am thinking about doing it with my nook as soon as the replacement comes in (they are sending me a new one because the old one died after only 4 months).  I had been having problems with the old nook from the start, such as spontaneous shut off, and never keeping charge as long as it should.  Over the weekend, it just died.  They said that they don't want the old one back.  I don't know if that is a bad sign, in that they expect that the whole unit is bad, rather than just the battery.  If I could replace the battery temporarily with a new one, and have it work, I was thinking it would be easier than loading all my epub documents back on the new device.  (I would just plug it into the computer, and move them onto the computer until I can plug the new one in and put them there.)  I haven't had the old unit apart, and thought that if I am going to upgrade the card, I could "borrow" that battery long enough to complete the job.  Then, if I new it was the battery and not the device, I could buy a battery for the old one and store music on it.

Any thoughts?

Popping off the back is easy to do just go to the B&N web site & download the PDF guide for you model.  As for a new battery they sell them at Best Buy....  Not sure os the price but few months ago they were $10 on sale.   I am surprised they dont wat the old one back tho  SO IF they change their minds Keep your old battery to send back with it!! 

I was surprised too, which is why I suspect they think it's a hardware problem.  When I talked to them last night, and they said  they would send another one, I asked what to do with this one.  They said 'you can keep it".  ...What???

So I figure, if the new one comes with no instructions to return, and if it was only the battery, I will turn the old one into a large music storage device.  That way, when we travel, I can have it loaded with all our music, and just let it play.  (And I'll still have my nook for reading)