ok so i have an epiphone 4 string i will post a pic not positive of the model cant seem to find one just like it, but i have had an offer to swap my epiphone 4 string and fender rumble 15 amp for a peavey 5 string, Peavey millenium ac exp to be exact im told it is in mint condition has avtive pickups that take 2 batteries, my main wonder is this a good trade and what kinda batteries am i gonna have to use on the pickups.