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Lotus is working on an add-on hybrid system that replaces the alternator with a starter/motor/alternator combo to add the stop/start feature to non hybrid cars.
Lights won't only put out less light at lower voltage, but will not last as long. I also wouldn't recommend it for some cars with already undersized wires for their lighting.
There is a Lithium-iron phosphate car battery made by Voltphreaks that weighs about 4 lbs. Also costs a grand or more. Odyssey also makes batteries in the 16-26lbs. range for a reasonable price.
Got my Cycle Ops bike trainer stand for under $50 on ebay.
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