First, let’s clear up the voltage confusion. The CLM18VRB is often listed as an "18V" mower in technical documents (referring to the nominal voltage of the lithium cells: 3.6V x 5 cells = 18V). However, CRAFTSMAN markets it as * (Maximum initial voltage: 4.0V x 5 cells = 20V).
: If you choose to purchase a third-party replacement, always check the return policy. Testing the battery immediately with your tool is crucial to ensure it fits and functions correctly. A little patience and the right information will have your trusty Performance Power tools back in action. pro 18v battery clm18vrb