To diy a pack using essentially canned batteries you're going to need whatever bracket/tabs they spot weld on to assemble, spotwelder, holding fixtures. Not sure you want partially charged batteries, so perhaps even some sort of discharge system. Figure a 5% waste learning how to actually assemble properly so they fit the cases.
Imho, pre assembled modules is the way to go, but that's a bit pricier.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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