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The charging driver is based on TP4056 integrated circuits. The charging current can be adjusted with a regulating resistor. If you use ready-made modules, the factory resistor charges with 1A. You can change this by replacing the resistor (check the phrase "TP4056 resistor").

The controller also has 2 step-down converters lowering the voltage. I wanted to get the best power supply parameters, so I set the converters to 7V, and then used a 7805 linear stabilizer for each charging module, giving a constant and safe voltage of 5V (the voltage from the converter is not ideal).

With my parameters, the elements do not heat up much, but I intend to additionally install a heat sink on the stabilizers.