Probably another bad question, is there a formula I can use to determine how long the batteries will last if I know the wattage, voltage and amps that are going to be drawn?
Got some music equipment I wanna busk with but theres no battery slot... So I was just curious, can't I just get 200 1.2v batteries then get a wall socket to plug it in?
Might be a bit simple minded but I'm curious.