Try the big 12v jump pack from Harbor Freight (in the US). Normally $49.
http://www.harborfreight.com/12-volt-jump-start-and-power-supply-38391.html
The Sept 2015 flyer sale price with coupon is $39.68. And you can recharge it from 12v DC between beeyards (or use AC). Looks almost the same as the "Jump-n-Carry" pack that Jason listed previously in a msg using the subject "mite protocols". That one retails on Amazon for $291.89.
Joe Lewis
Bel Air, MD, USA
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