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Canon EXO II Issue

So I was on a shoot yesterday, everything was working fine, until suddenly the recycle time on my flash increased. Like I could normally shoot in burst and not have an issue, but now its like 1-2 seconds between charges. I also can't change the power of the flash. The number changes but the flash itself fires the same, and its as if its firing on 1/1, even its its set to 1/128. I've tried everything I can think of to fix it but I'm not having any luck. Can anyone help?


Sounds like a battery that is not at full charge.

"The right mouse button is your friend."

Can't be, all the batteries are fully charged. That was my first suscpicion but its not.

Could be a failing battery.

Issue only started when I tried turning the flash into HSS, but could be. I'll try brand new batteries see what happens. But how does failing battery mean the flash power won't change?