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The only thing I don't like about using a 36V 18ah setup would be range. W/ only about 650Wh available, they could only push the cyclist ~12 miles at 10mph. 36V of small starting batteries should yield about ~35+ miles at 10mph, while adding ~60lbs more than the smaller setup. If there are smaller batteries to be found for cheap I think they would work just as well w/ a couple parallel strings but at a slight weight penalty per kWh (more packaging), but AFAIK the only cheap batteries I can get consistently are used starting batteries for ~$10-25/kWh.
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