So I tried the Eneloops this past Sunday and they do help cycle the flash faster in less than 1.5 seconds. But eventually they died out and used the second set of Eneloops. Both ended up getting hot after they were done and then ended up using a set of energizers. I kept the flash at 1/4 and 1/2 power all the time. Did use it as it was used in church and the reception for the event (beptism) was in a small restaurant. No room for my Speedotron. Did feel that it did get good use out of the new batteries. I wasn't expecting to use the one during the 4-5 hour event.