Lightweight AGM != lightweight Lithium-ion. An AGM battery is still a lead-acid battery at heart. Li-ion is a big leap forward in capability at the expense of, well, expense
The battery OP installed is around $1,000-1100 for the equivalent battery. The best application for a street car from voltphreaks is their 9lb 45aH 1200CCA unit at ~$1700. At 52lbs of weight savings, that's not such a bad cost/lb ration compared to the other stuff people do to lose weight, but still nutty expensive unless you're competing with the car or just doing it for fun
Last edited by Richbot; 02-22-2013 at 05:59 PM.