I am trying to charge a lithium-ion battery in the mppt solar charge, but it seems that the 3 wires of black, yellow and blue are (-) and the red is (+) in a 4-pin type. ) Is it necessary to connect to +- to the mppt charging terminal by subtracting the 3 wires?
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I wonder why (-) is a 3 line!
Where can I get a standard like a 4 pin cable?
The lithium polymer battery shown on the left is not one cell but three cells connected in series.
When two or more are connected in series like this, one of them is discharged more due to the difference in cell capacity, and one of them still remains, and the imbalance becomes. In such a case, the wire was removed in order to charge the balance evenly for each cell.
Charge using a charger that supports balanced charging as above to ensure even charging for each cell.
Of course, you can use the main line (thick red, black) instead of doing this. If it is 3 cells, you can charge it according to 12.6V, but if you continue to use it, the state of charge between the cells will slightly shift. It is recommended to recharge the balance at least once every 6 months to a year.