This current is cell-specific, but usually the supplied energy (in Ah) should be less than 80 percent of battery capacity (Ah).
First, until they reach a threshold voltage the charger behaves as a constant current supply. Li-Ion cells need to be charged in a two-step process. Using a linear regulator does not solve the heat production issue, but at least I can put it on a heatsink. Therefore I'll build my own Li-Ion battery charger, with LM317 (LM338). Another limitation of those modules would be that the maximum charge current cannot be changed unless I replace a small SMD resistor.
Since I have parallel pairs of cells from notebook batteries, I would like to charge them with a higher current. Build this simple yet versatile charger for Lithium Ion cells with LM317 or LM338 and TL431Įven though I have some TP4056 modules for charging Li-Ion cells, those small PCBs generate a lot of heat and the charging current decreases with temperature increase.
