Well that lets people have the best of both worlds. Few serious tradesmen who use a tool all day are going to use a battery with an adapter. Ergonomy is a big f

Well that lets people have the best of both worlds. Few serious tradesmen who use a tool all day are going to use a battery with an adapter. Ergonomy is a big factor, tools get updated regularly anyway, and it's not a big deal to buy into one or more systems. But if someone for whatever reason has a hodge-podge of tools, they can get an adapter.