Hmm...
Perhaps I'm the only guy who thinks carrying lead onto an airplane is a bit silly. Lead-Acid batteries are not the way to go. I want a total packed weight for a battery pack to be under 1lb, it needs to be able to provide at least 3 amp-hours. A few CR 123's seem to be the only way to go if I want to be able to power up anything for a reasonable amount of time.

As you may recall, I refuse to check baggage, so every ounce I cut from my packing is vital.