Question about JJC Battery Pack FB-1

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Name
Tony
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I've just plugged this into a 580 EXII for the first time having fully charged - and correctly fitted - the batteries in both , but there doesn't seem to be any indication on the battery pack that it's actually working (i.e. connected properly to the flash and providing power thereto).

I've read JJC's instructions, and although they seem to imply that there's an indicator light on the unit it's hard to tell whether that's what they actually mean or whether they're referring to a light on the flash instead. Can someone help please, as at present I have no idea if the unit's operating properly or or not?
 
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