To set the stage... <br>I'm using a Canon 10D; Canon Speedlite 480ex; four Duracell AA batteries. <p>My 480ex takes some time to power-up between flashes. I've seen the photogs at work (with a Nikon D1h and some sort of Nikon Speedlite flash) take multiple flash shots without skipping a beat and they aren't carrying around some sort of external booster pack. <p>Is it normal to need to wait 10-15 seconds between shots? While this may not sound long--it's like a lifetime when you're behind the camera watching facial expressions and hand movements change while you're waiting for the green light. Granted, I'm not using fresh out- of-the-package batteries each time, but new batteries don't seem to do much better. Besides, it's costly to only use batteries once then toss them out. <p>Would an upgrade to a 550ex give me faster power-up time?