[legion]

I've been using Sears Craftsman C3 19.3 volt tools for 15 years now. I used to have problems as described in the OP. I upgraded from NiMH to LIon, then just went to large capacity LIon. Outside of major project, I basically charge them twice a year. I have 4 batteries, and can charge two as I use two. Works great for high-load projects (like driving lag screws).