you dont need battery. farout most drum sounds can be added and will end up on the keyboard style interface…so its best to learn to make the beat in that interface instead within some fancy program, becuase the piano window always looks pretty much the same for different drum programs (vsti’s) or even other sequencers (cubase, logic etc)….so best to learn it a way that will problably give you a longer period of possible use (the future).