If you did not register your battery with Ridgid at the time of purchase there is a good chance they will NOT warranty them. Ya thanks for not telling me that Home Dept when I bought a combo kit. Anyway you can get these for about half what the Ridgid ones cost.

FYI: You can charge these on any Ridgid charger that charges lithium batteries. Here is one if you don’t have one.

This is a dual chemistry battery charger by the way. It will charge both NiCd and Lithium batteries, Ridgid or other brands.