I am working on a battery build project to drive a small 12V electric motor (7A max current draw), and so far I have gotten this far:
- I will use Li-ion 18650 cells in a 4S6P configuration
- I will wire up the cells in parallel first, series second
- I will use a balancing 4S BMS with balance wires connected between each of the units in the series
So the motor is rated for 11-15V, so at max voltage, the battery would be out of range. Because of this, I want to use a buck converter to output a steady 12V.
Where I am a bit lost then is, how can I charge the battery? Do I just wire an input path and output path in parallel, with a buck converter set to 16.8V on the input and 12V on the output, or do I need some other components there?