WORK IN PROGRESS! Made this in TinkerCAD. I have many craftsman Nextec tools that use the same 12V Lithium Ion battery. My goal here is to make an adapter that'll allow me to use these batteries on many other projects around the house, like my son's RC Cars. ToDo: -Rev 13 is a VERY tight fit. I hope to improve that with the next version. -Improve holes for battery connection. The idea here is to use a simple cotter pin. Push it through the bottom. Lay it down and then route wires to the cotter pin's loop and solder the connection.