It may look a little silly, but has anyone thought of using a PT with one of those portable usb battery chargers? You could stick the batt in your pocket and walk around with a portable 5v PT. This one says it can charge at 1 amp for two hours. http://www.engadget.com/2010/08/31/sanyos-eneloop-stick-and-mobile-boosters-will-juice-your-gadget/
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