Question: are all dewalt batteries compatible?
Answer: ALL DEWALT 20 volt batteries are compatible with ALL DeWALT 20 volt tools, any 20 volt battery will fit any 20 volt tool! Furthermore, any DeWALT 60 volt FlexVolt Battery will fit ANY DeWALT 20 volt tool. ... The more "ah" (Amp Hours) a battery has, the longer it can power the same tool between charges.