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NiZns recharge around twice as fast as Sanyo Eneloops, but last maybe 75% as long and require a different charger.

See this discussion thread.

If you use your flashes continuously in a short amount of time, a higher capacity NiMH will actually perform better than a Low-Self-Discharge NiMH like eneloop. If you don't intend to discharge the batteries in a shorter period of time, they will begin to self-discharge and LSD has the advantage. Here are some recent test numbers I found for non-NiZn:

Alkaline: 4.0 sec. min. recycle time; 110 min number of flashes
Lithium: 4.5 sec. min. recycle time; 230 min. number of flashes
Ni-MH (non-LSD 2600mAh): 2.3 sec. min. recycle time; 190 min. number of flashes
NiMH (LSD eneloop): 2.3 sec. min. recycle time; 165 min. number of flashes

This older chart in a Nikon flash manual is in agreement:

With NiMH, a smart independent channel charger is essential for best performance. Otherwise you are overcharging and undercharging certain cells, leading to greater wear and worse performance.

NiZns recharge around twice as fast as Sanyo Eneloops, but last maybe 75% as long and require a different charger.

See this discussion thread.

If you use your flashes continuously in a short amount of time, a higher capacity NiMh will actually perform better than a Low-Self-Discharge NiMh like eneloop. If you don't intend to discharge the batteries in a shorter period of time, they will begin to self-discharge and LSD has the advantage. Here are some recent test numbers I found for non-NiZn:

Alkaline: 4.0 sec. min. recycle time; 110 min number of flashes
Lithium: 4.5 sec. min. recycle time; 230 min. number of flashes
NiMh (non-LSD 2600mAh): 2.3 sec. min. recycle time; 190 min. number of flashes
NiMh (LSD eneloop): 2.3 sec. min. recycle time; 165 min. number of flashes

This older chart in a Nikon flash manual is in agreement:

Here are two videos, one comparing NiMh vs NiZn and the other NiMh with battery pack vs NiZn: http://www.flickr.com/photos/9899098@N04/4301938143/in/photostream/
http://www.flickr.com/photos/9899098@N04/4301902023/in/photostream/

Reportedly, it makes an even bigger difference with flashes older than that 580 EX II

With NiMH, a smart independent channel charger is essential for best performance. Otherwise you are overcharging and undercharging certain cells, leading to greater wear and worse performance.

NiZns recharge around twice as fast as Sanyo Eneloops, but last maybe 75% as long and require a different charger.

See this discussion thread.

If you use your flashes continuously in a short amount of time, a higher capacity NiMH will actually perform better than a Low-Self-Discharge NiMH like eneloop. If you don't intend to use them all within a day, LSD NiMH and NiZn have the advantage. Here are some test numbers I found for non NiZn:

Alkaline: 4.0 sec. min. recycle time; 110 min number of flashes
Lithium: 4.5 sec. min. recycle time; 230 min. number of flashes
Ni-MH (non-LSD 2600mAh): 2.3 sec. min. recycle time; 190 min. number of flashes
NiMH (LSD eneloop): 2.3 sec. min. recycle time; 165 min. number of flashes

This older chart in a Nikon flash manual is in agreement:

With NiMH, a smart independent channel charger is essential for best performance. Otherwise you are overcharging and undercharging certain cells, leading to greater wear and worse performance.

NiZns recharge around twice as fast as Sanyo Eneloops, but last maybe 75% as long and require a different charger.

See this discussion thread.

If you use your flashes continuously in a short amount of time, a higher capacity NiMH will actually perform better than a Low-Self-Discharge NiMH like eneloop. If you don't intend to discharge the batteries in a shorter period of time, they will begin to self-discharge and LSD has the advantage. Here are some recent test numbers I found for non-NiZn:

Alkaline: 4.0 sec. min. recycle time; 110 min number of flashes
Lithium: 4.5 sec. min. recycle time; 230 min. number of flashes
Ni-MH (non-LSD 2600mAh): 2.3 sec. min. recycle time; 190 min. number of flashes
NiMH (LSD eneloop): 2.3 sec. min. recycle time; 165 min. number of flashes

This older chart in a Nikon flash manual is in agreement:

With NiMH, a smart independent channel charger is essential for best performance. Otherwise you are overcharging and undercharging certain cells, leading to greater wear and worse performance.

NiZns recharge around twice as fast as Sanyo Eneloops, but last maybe 75% as long and require a different charger.

See this discussion thread.

With NiMH, a smart independent channel charger is absolutely necessary for best performance. Otherwise you are overcharging and undercharging certain cells, leading to greater wear and worse performance.

NiZns recharge around twice as fast as Sanyo Eneloops, but last maybe 75% as long and require a different charger.

See this discussion thread.

If you use your flashes continuously in a short amount of time, a higher capacity NiMH will actually perform better than a Low-Self-Discharge NiMH like eneloop. If you don't intend to use them all within a day, LSD NiMH and NiZn have the advantage. Here are some test numbers I found for non NiZn:

Alkaline: 4.0 sec. min. recycle time; 110 min number of flashes
Lithium: 4.5 sec. min. recycle time; 230 min. number of flashes
Ni-MH (non-LSD 2600mAh): 2.3 sec. min. recycle time; 190 min. number of flashes
NiMH (LSD eneloop): 2.3 sec. min. recycle time; 165 min. number of flashes

This older chart in a Nikon flash manual is in agreement:

With NiMH, a smart independent channel charger is essential for best performance. Otherwise you are overcharging and undercharging certain cells, leading to greater wear and worse performance.