Hi Butch, why should there be any problems? All flashes can use rechargable batteries. I have powered my big Sunpak (can't remember the number, but it was their second-best model) with custom-built NiMH batterypack, without any problems. If I remember Sunpak even sold a "batterypack" which was nothing else than just 4 AA or C NiMH cells together in custom casing for some ridiculous amount of money.
Get some good NiMH cells, ones recommended for RC models, as the flash can draw several amperes a second when charging, which can be too much for some older/cheaper cells, which have higher internal R. I have even added one more cells (5 in total) to decrease recharge time of the flash. Best regards, Frantisek Vlcek
