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12v 3s lithium ion battery using a 7ah lead acid battery.
I see, each paralleled set is made up of six cells. There are three sets of paralleled cells. The three sets are then wired in series. The balance leads go to an external lithium cell balance regulator, wired for the three sets. It would be nice to install an internal balance pcb. I wonder if we could find, or fabricate our own lithium cells to take maximum advantage of the area in each of the cell compartments?