I checked my Quantum Battery Two voltage tonight. I just unscrewed the connector from the bottom of my AF 400T, and plugged the cable into the battery. It's delivering a straight nine volts. I don't know much about electronics, but that says to me that any transformer circuitry has to be in the flash. I believe Brendan reported here that the Pentax TR Power Pack III dedicated battery outputs something like 360 volts DC. So I'm guessing that the Battery Two is not likely to be compatible with the 540 flash. I assume Quantum would have to produced a module control device to make it work??? Paul
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