I have Ryobi and Craftsman tools acquired for cheap from garage sales and auctions. I have M18 batteries so I decided to make adapters from some junk batteries that I have. Bought this adapter on ebay https://www.ebay.com/itm/Milwaukee-...830058?hash=item2f0eec4caa:g:cJoAAOSwH2VaCzCO. Gutted the cells out of the old batteries and attached the adapter. Both work great. I only have to have one battery system and charger now. Some people may ask why not buy M18 tools? I am cheap. I cannot justify a M18 hedge trimmer when I only use my $25 Ryobi once a year.