As I mentioned, I can get BP-5L batteries for less than a couple bucks apiece - so aging is not an issue really - buying new ones every year would still be a lot cheaper than AA batteries + external power unit,etc. Not to mention that some of these require different power convertors/tips - I already carry the charger to the n800 and don't want another. I'm hoping to talk to some modder types who can figure out an external battery pack that the BP-5L will fit in and power the n800.