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The Lithium Iron Phosphate battery is the ultimate in weight versus power technology. This battery weighs in at only 2.12 pounds and offers an incredible 270 C.C.A. This is a drop in replacement for your Lead-acid battery, and will require no change to your stock charging system.
Has anyone used or tried these out?
http://www.batterystuff.com/batterie...18A1-BS12.html
http://www.shoraipower.com/default.aspx
I can shed 10 lbs off my bike !