I use 12-volt battery operated drills on an occasional basis about once a month. They are kept on the charger when not being used. When the time comes I push them hard.

Some of the batteries are not holding their charge as well as when they were new. They have been used only 15 20 times and are pooping out.

My question should batteries be stored on or off the charger during periods of inactivity ?

Thanks for your help.