Batteries in your Speedlite 580EX II, MT-24EX and MR-14EX flash units will usually provide more than enough power for most uses but sometimes you want to take lots of pictures with flash, the flash needs to recycle really quickly, you might want to use a high power burst of flash frequently. The Canon CP-E4 battery pack provides an extra power source to help you to do this.Who is it for?Any photographer making use of flash extensively should consider the CP-E4. With eight AA batteries, it will help the flash to recharge even quicker and will give you more flashes between battery changes.Key features- Eight x AA batteries for longer life- Faster recycle times for the flashgun Technical details Product colour Black Protection features Dust resistant, Waterproof Compatibility Canon Speedlite 580EX II, MT-24EX,-14EX Camera brands compatibility Canon Power Battery type AA Weight & dimensions Weight 220 g