Review on Powerful Replacement Charger for Craftsman C3 19.2V Batteries - Ni-Cd and Lithium-Ion Compatible by Bill Tripi

At first I was thrilled when I received the charger, but I quickly realized that since I use original batteries, the connections sometimes don't fit. I've had a few instances where I tried to charge my battery and got notifications about bad indicator lights. Batteries are fine, but sometimes it takes several attempts to correctly insert the battery into the charger. I think the problem is that while they are very similar, the sizes don't match so the battery doesn't always fit snugly and you can't look inside to see what doesn't match. When it works, it will charge quickly and the battery will last as before. I recommend taking a look at the design to make appropriate adjustments for a better fit.