All Metz 60CT (CT1, CT2 and CT4) use the same battery pack. The battery pack uses either a 6V lead acid dry cell or 6V NiCad. It converts the 6V to about 360V DC to charge the capacitor which is in the head(That's what I measured) as well as supplying 6VDC to the control electronic in the head. The cable has 3 pins. You can try to build one but all I can say is good luck. Let me know what you ended up doing.