Originally Posted by
neuroanatomist
I would not expect them to be different in terms of flash recycle times. The eneloops have lower self-discharge (meaning you don't have to charge them the day before you use them), and better longevity (more recharge cycles - current ones are rated to 1500 charge cycles).
The faster recharge of the 430EX II is simply due to it's lower output, which requires a smaller capacitor. The 4 batteries dischare at the same rate in either flash, so the smaller capacitor fills faster.