Originally Posted by Klaatu
I recently returned from a 3 week vacation in East Africa where my access to power outlets was limited to non-existent for days at a time. The amount of time the battery in my Sony PRS505 lasted was very important to me. Admittedly I wasn't reading for hours at a time for days on end, but the fact that I can got at least 2 weeks between charges with regular reading was good to know while I was on this trip. It meant I didn't have to worry about the battery dying and not being able to charge it.
A plus the Nook has for those in your circumstance is that you can take with you a second (easily replaceable) charged up battery with you on an extended trip.