21 of 21 people found the following review helpful
This review is from: Canon COMPACT BATTERY PACK CP-E4 (small battery pack for 580EX II Speedlite) (Accessory)With Canon Speedlites like the 580EX II you will find that the recycle speed has increased vastly over older units like the 550. Saying that, if you want to change batteries less frequently and have a fantastic recycle time this CP-E4 will do the trick.
External battery packs have a habbit of being VERY expensive. If you are a pro photographer that requires the ultimate in recycle time and overal battery life you won't be looking at this unit. BUT!....if your recycle time and overall battery life requirements are still very demanding this unit won't disappoint.
To be honest, I was sceptical about this CP-E4 when I purchased it.......however, after a number of photo shoots it has turned out to be far better than I had expected. It is also slightly better contructed than I had expected.
For the money, this will perform.