How To Charge Button Batteries. To charge one battery from 37V calculate voltage difference as V 37V-15V 22V. Put a quick charge on a button battery or a watch battery or a CR2025 battery.
Ni-Cd and Ni-MH button cells can be recharged using a voltage of 14 Volts just like other larger batteries but at a lower current to prevent overheating. Clean the car battery to remove any corrosion then store the car battery in a dry location that is cool but will not reach freezing temperatures. I was using these batteries in a bathroom scale.
Limit your current to 40mA so calculate serial resistor as R 22V40mA 55 Ohm.
You will notice it is charging your battery without any trouble. Then you have to place the battery on the charging platform of the clip charger. To charge one battery from 37V calculate voltage difference as V 37V-15V 22V. I folded the wrap accordion style.
