It happens sometimes.. You forget to charge the m12 battery and you pull the trigger on your 3/8" impact to wing them bolts out of that water pump or whatever you working on. Your choice now is wait an hour to charge the battery or use your manual ratchet like we do which sucks when you get used to cordless power tools. Well, this little beauty is not made by that Red company. Goose-Grip has it exclusively. Your M12 tool will work like you never before seen it work and I promise you will love the response. You may even use it all the time instead of the battery and it weighs like 2oz so your tool is lighter. There are no cells in this battery housing.  Hook up the alligators  to any 12 volt DC source (vehicle battery) and it is awesome.