https://www.homedepot.com/p/Milwaukee-M12-12-Volt-Lithium-Ion-Cordless-3-8-in-Crown-Stapler-Tool-Only-2447-20/302652845?source=shoppingads&locale=en-US&gQT=1
Get this and be done with it if you are stilling thinking on batt insulation. That Milwaukee or their own Rigid brand will work. It will save you a lot of cussing.