extra battery pack for flash!
I believe the CP-E4 external battery pack for the 580EX II will shorten the recycle time. I have one, but only use it at events where I'm taking a lot of flash pictures so I don't miss important shots when my batteries run down.
I don't think there is an external battery pack option for the 430EX II.
|Waffles with fruits by Coolinarka|
from Food photography (desserts)
|Vestrahorn Frozen Reflection by Will B Milner|
from Ice cold