The flash needs AAs inside it to power its internal electronics.  They
don't recharge the flash capacitors when you have a HV input, but run
the computer/lcd/indicator lights, etc.  Good luck.

Mike



"K. Michael Rose" wrote:
> 
> Can anyone tell me if the 550 requires batteries to be fresh in the
> internal holder while using an external pack (such as the Transistor
> Pack E)?  Or is there something wrong with my pack and or flash?  I've
> asked a few of the other photographers and they all think the same thing
> - that the HV input should bypass the internal power...however, to be
> honest, we all have never given this much thought before.
> 
> As I'm covering the Moscow situation, I'd appreciate a quick reply...
> 
> Thanks

-- 
Michael Shupe
M.J.Shupe Photography
Michigan Tech University
www.northernlightsgallery.com
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