esr is internal resistance and the ability for the power to be used quickly, this is why caps are so beneficial because they can charge/discharge large amounts of current although in a smaller time frame. it matters because when the sells are in series they can become unbalanced due to different ESR's between the cells so they should be matchedWhere would I get those at I can't find any besides eBay, and what does ESR mean ?
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i think this is the source i was checking for new banks:
https://www.tecategroup.com/products/partfinder.php?SERIES=K2-BCAP
$244 for 6, you'll need to get/make bus bars from ebay