The idea of a pulse waveform module is to prevent thermal runway. It can also be done by limiting the current. I made a current limiter that uses the non linear resistance of car headlight bulbs. I soldered red wires to the common pins of 4 headlight bulbs. Then i soldered black wires to the remaining 8 pins. All the red wires are connected to an input line and all the black wires are conneced to an output lead. The resulting resistor drops 3 volts at 20 amps but the resistance increases if more current is drawn. I am using it with 4 cells in series. My experence with this is limited. More will come later.
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