Search Amazon for 'Milwaukee M12 battery adapter'. It'll all be 3rd party, never used any, couldn't tell you which one to pick. But choose one you know you'll be able to work with. Buy this 2 pack 3rd party 12v batteries. Search FB marketplace, OfferUp, Craig for M12 charger, shouldn't be more than $15. Looking at $75-$80 total, pretty small footprint, will always be able to be on. Plus the M12 line of tools is pretty sweet