Please let me know if anyone had success with a portable rechargeable battery for the Nook Tablet...and which brand it is.

We're going camping in a few days, and I would prefer not to be running back to the car to charge my Tablet. I have been unsuccessful with two that I've purchased (and returned)...the Targus, and another brand from Best Buy. We already have a small one that recharges our cell phones, but they do not work with the Tablet.