Milwaukee to Makita 18V battery adapter
This is adapter for using Milwaukee batteries on Makita tools, 18V system compatable. There is third pin in Makita tools, which is temperature sensor for battery, it can be ignored if making 1 Ohm resistance connection between this pin and + side of power pins. It is not my responsibility for battery usage and safety, everybody who uses such solution must be studied all risks and taking risks on their own and with some certified electrician in company. This masterpiece can be printed from any material, I printed from PLA, works good, makes good connection without movement. There also must be added, soldered and fixed by hot melt glue some wire end connections, who can easily be stiched/pushed in pins, making connection.
Good luck! And give back some feedback, how are going Your things!!!
There is more info and process of making - https://youtu.be/-3q015u5G0w
Also, if You do not want to make it by Yourself, You can buy these adapters freely in Chinese stores online, for pretty cheap prices.