¿Want Lithium?
http://www.getlithium.com/1-lithium-ion-battery-pages/12V195A-30H-Car-Truck-Marine-lithium-ion-batteries.html Read the entire page. This seems to be a reputable company.
Forum Discussion
Nice! One 57 lb. battery that has 88% of the usable capacity of my four GC2s at 250 lbs. Sign me up when the price is an order of magnitude lower.
