Be prepared and swap batteries in an instant with this extra AA battery magazine for the compact battery pack CP-E4 / CP-E4N. Keep a spare, loaded CPM-E4 in your bag to minimise the time it takes to replace batteries.BenefitsKeep a spare, loaded magazine of batteriesWorks with the compact battery pack CP-E4 / CP-E4NCompatible with selected Speedlite flashesTakes 8x AA batteriesBe prepared and swap batteries in an instant with this extra AA battery magazine for the compact battery pack CP-E4 / CP-E4N. Keep a spare, loaded CPM-E4 in your bag to minimise the time it takes to replace batteries.BenefitsKeep a spare, loaded magazine of batteriesWorks with the compact battery pack CP-E4 / CP-E4NCompatible with selected Speedlite flashesTakes 8x AA batteries