What I would do is find someone who installs solar electric systems and offer to trade them a few forklift batteries for a few golf cart batteries, pound for pound you are going to be better off because for the same weight you can have a big pile of golf cart batteries giving you a higher end voltage... altho 900 volts is still way up there.
Either way, I think it would be worth trading up to equipment that will better suit a car,
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