I have the same Sullivan starter as Tim 220225. It's an awsome starter and I have never needed the 24volts. I just use the 12volt lawn mower battery I haul around with me anyway. I don't normally need this starter with my gas engines but have used it when an engine is new just to make sure my fingers remain intact. Also at the field when someone has something stubborn going on with their engine I get out the big Sullivan. Big engines don't even seem to phase this starter and I couldn't be happier with it. Bill