If I am using three 600ex-rt flashes (one on camera, 2 off camera) in ETTL mode during an event which is held in decent light at night time indoors, how long will it be before my rechargeable batteries will die out in all the flashes?
I use 2500mAh energizer batteries for my flashes.
I have a 5 hour event coming up in future and I am just wondering if I should change all 12 of the batteries in three flashes after about 2.5hours into the event to ensure that they don't run out anytime during the event. Or do you guys think 12 fully charged reasonably new 2500mah batteries can do an entire 5 hour event without losing much charge?
Have your batteries ever died out / gone to a point which makes them recycle slower while doing a continuous event like this?