I disagree about the knock off external battery packspwp said:For external power, the options begin with aftermarket knockoffs of the Canon battery pack which takes 8 AA cells; readily available on eBay. The knock-offs are almost certain to disappoint. At the other end of the scale is the unbelievably durable, justifiably expensive Quantum Turbo series of batteries. This is what I have used for years.
I have 4 yongnuo external battery packs at $46 each they are great filled with eneloops the flashes are good to shoot all day with no battery change and fast recycle time. they are a great matchup with the 580exii
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