Is my battery pack for my sb800 working?
With the imitation SB 8A battery packs I have the red light on the pack serves as a control which lights up immediately after I've taken a shot
They also have an extra synch cord (apart from the three in one that goes in the front) that goes in the pc synch on the side of the SB800 for extra connectivity
They have cost me a fraction of the original SB8A's and work just as well (especially considering how often I use them)
all in a day's work