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you need a balancer or bms, or "cell shield" type bms devices, little pcb's that connect to every cell and make sure its not overcharged, and when its near full, use a transistor/resistor combo to bypass some of the charging current, untill eventually all of them are full/passing all the charge current trough the resistor, and thus balanced.
the cheapo way is to connect all the cells in parallel, and charge them all at once, a good idea to do once before assembly, charge all the cells to the same level, that would balance them out quite nicely already.
the cheapo way is to connect all the cells in parallel, and charge them all at once, a good idea to do once before assembly, charge all the cells to the same level, that would balance them out quite nicely already.