In this video demonstrate the making of a 12v or 11.1v li-ion battery.
This is made possible with 3.7v li-ion 18650 Cells
It also include a BMS to protect it from overcharging and short circuit.
Here I have a row of three batteries connected in series.
Then 2 rows are connected together in parallel, you can connect as many rows in parallel as you want to increase the current output and capacity of the battery.
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