Drbobcameraguy wrote:
Yes current and voltage is all the small phone charger does. The cut off and step down is part of the device you are charging for the new stuff. Car or bigger battery chargers or chargers that charge a battery out of the device are not that way. The charger controls current and time. There are basically 3 types of automotive batteries. Reg, gel, and mat. Each type must be charged differently. I have a fancy charger for those. Lol.
I often need to charge battery without the BMS built in. I don't just use a power supply to charge them.