Hi, I wanted to know if the Craftsman 18v batteries are compatible with the 19.2v tools. I bought a 19.2v circular saw without a battery. A set of two 19.2v batteries and a charger costs $70. Now the 18v craftsman tool set consisting of a drill, flashlight two batteries and a charger costs $70 as well. I'd would much rather buy the tool set for the same price for a sacrifice of 1.2v.