Well, I am certainly glad I asked the more enlightened. I was trying to use it for other than it's main function. I can't justify hauling the thing around for the remote chance of gaining 30 min of battery power, as Gary said, Bachus, I certainly see your need. My main venue has it's own backup system, and I would have less than a five minute interruption to reboot. I guess I was thinking more along the lines of a hotshot battery in automotive parlance.

Thank God for Nigel and his forum, which translates to my friends therein.