I have 6 , 20v, Lithium batteries with 2 chargers.  I used them with my Black and Decker weed eater which no longer operates.  I have not used these batteries in over a year, but they did work at that time.  One of the batteries, which I marked as "Good???"....may have a problem...don't remember!  Anyway...if you need extra batteries or a charger you might want to take a chance with these.  I quickly plugged in each battery....they indicated by a blinking green light that they were accepting a charge.h