Canon Cp-e3 Compact Battery Pack
What's Included With This Item:
For use with 580EX, 550EX, 540EZ, 430EZ, MR-14EX, MT-24EX Speedlites. Accepts eight AA-Size Lithium, Alkaline and Rechargeable Ni-MH or NiCd Batterries.
This battery pack reduces full power recycling time from about six to 1.7 seconds and increases the number of full-power flashes per charge from approximately 100 to 432.