The external Canon Compact Battery Pack CP-E4 improves flash recycle times significantly and increases the number of firings before batteries need to be replaced.
The pack takes optional rapid-change magazines that can be loaded with 8 AA-size batteries prior to a shoot to ensure fast and smooth transitions from one battery set to the next - important in critical shooting situations or to keep up momentum in the studio.
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This updated version has been improved with better dust and moisture sealing at the contact points, to get it to match the weather-resistance characteristics of the 580EX2 Speedlite.
Compatible with 580EX/2, 550EX, 540EZ, 430EZ, MT-24EX and MR-14EX Speedlite Flash Units