There is at least one company making adaptors for power tool batteries [1], so that you can do things like use your Black & Decker drill battery with your Milwa

There is at least one company making adaptors for power tool batteries [1], so that you can do things like use your Black & Decker drill battery with your Milwaukee circular saw. They seem to be mostly around $30, but might be worth it for someone with a lot of tools with different batteries who wants to minimize the number of different chargers they have to deal with. https://powertoolsadapters.com/ https://powertoolsadapters.com/