So I finally brought my camera out riding with me last night and got a some pics of my wife and 2 other guys at our local jump park. One thing I've noticed with my flash is that it doesn't take long before I can only get one shot with the flash going off and then I get 1 or 2 where it doesn't fire and then 1 more when it does. This is with the 30D set at 5fps. What do you guys do about batteries with your flash and would the 580 help me much with this? OK so the original ones looked like garbage so I'm redoing them and I'll add them back.