I recently got a battery pack CP-E4 to go with a 580 ex
The documentation says that you should wait 20mins after taking 20 consecutive shots.
Would this be at 1/1 power? and what if you take 5 consecutively does that mean I should wait 5 mins?
From your experience what is generally the real would experience.
I'm asking because I'll be shooting a wedding a little later and I'm not too keen on blowing a flash.
Cheers.

