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I'm entertaining building my own lithium pack from a large box of used computer batteries fyi. It involves things like building a battery tab welder out of a microwave transformer and sorting out an appropriate and affordable BMS and charger and dissecting the packs and matching the cells, ditching the bad ones. Lotta work, not sure I'm up for it, but the batteries themselves will be like $100 (or free if you are really good)
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