Canon 580EX MK1 Battery Packs

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Hey all! :wave:

I have an outdoor vehicle shoot to do in May and it will be fast paced and I wont have time to be switching batteries in my Speedlite during. I would also like the faster cycle times that they offer.

There does not seem to be too much info on them so I was wondering if anyone has got/used one? I am looking at the CP-E3 and CP-E4 (the latter I am not sure works with the 580ex mk1?).

Thanks in advance.

[u8myufo]

Check it out
http://shopping.aol.co.uk/product-details/canon-cp-e4-battery-pack-for-the-580ex-mkii-speedlite/view-details/47414740

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Cheers for the Link. Just been checking the Canon Accessories brochure and apparently the E4 will work with any that have the correct port. Incidently they call it the CD-E4 - think it may have been a typo!