hey guys i just started working with the LM2596 DC-DC step down motor.
One of these "motors"? Your translator failed you badly. Those are not motors.
I thought of using it to charge my lithium ion batteries two of them combined each 3.7v 2200mah. Is is safe to use the step down motor to charge it
No, definetly not safe. Get the charging wrong and the batteries can catch fire or explode very violently.
Thanks...so is there a good way to charge it........