I've found my previous 3.6V Sears (model 315-111690) to be invaluable. I've even used it to take off wheel nuts after they're broken loose. I had to take it apart tonight and found that it's held up really well for all the crap it's taken over the past 10+ years but its a complex Ni-cad design and I'm not into fixing tools AND cars simultaneously. Time for a new one! What works good?