There is one thing though with these batteries (eneloops) that you have to keep in mind. Use smart chargers that prevents over or under charging. I had an issue once where i had charged several eneloops on different chargers (not smart) and one of my strobes stopped functioning. After trying to figure this out for a while a pro-underwater photographer pointed out that if the batteries used were not all equally charged there can be an issue. As the strobe was under warranty Inon replaced the same without giving the reason why this happened. Here is what they wrote:
When the camera battery is low , the triger signal from camera is not recognized on Z240 strobe, Z240 recongnize it as "noise"
And it cause some circuit trouble.
Also dual sync cable loss the signal power, and the reason for this trouble.