my ign is same side as shauns on engine box but mounted vertically the batterys are 1 4800 4 cell 2s-2p 7.4 volts battery on rx 2400 on ign 6.6 oz and 3.3 oz those are the mpi reg switches you see mounted between the the rudder servo and rx tray mounted on a couple peices of wood i glued in .

Both the batterys are fromeco and can be seen on there site