I certainly understand this desire. It's why I have Anton/Bauer Gold Mount adapters for all my production equipment. I don't have to deal with a variety of battery types. Two interchangable chargers, a pool of interchangable batteries, a few adapter plates to double-up & hot-swap batteries when there will be a need, and everything just works.

I don't see a battery standard--even a proprietary 3rd party one like Anton/Bauer--taking off in the consumer electronics space, but it's nice to dream. The closest I've come was when my Fujitsu Stylistic 500 tablet and my Sony Mavica digital camera used the same batteries.

Hrm. A Gold Mount adapter would be larger than the N800 itself, but even a "tiny" 14.4 volt, 30 watt hour ProFormer battery would power the tablet for a while, I bet...