B-17BOperationCompatible batteries and replacement/rechargingWhen replacing batteries, use 4 fresh AA-size batteries or fully-chargedrechargeable batteries of the same brand. Refer to the following table todetermine when to replace batteries with fresh ones or recharge batteriesaccording to how long the flash-ready indicator takes to come on. Do notmix old and new batteries or batteries of different types or makes.Battery type Time the flash-ready indicatortakes to come on1.5 V LR6 (AA-size) alkaline battery 20 s or more1.2 V HR6 (AA-size) rechargeable Ni-MHbattery 10 s or more• For minimum recycling time and number of flashes for each batterytype, refer to “Specifications” (0H-23).• Alkaline battery performance may vary greatly depending on themanufacturer.• 1.5 V R6 (AA-size) carbon-zinc batteries are not recommended.• Using an optional external power source increases the number offlashes and provides shorter recycling times (0H-17).v Additional precautions regarding batteries• Read and follow battery cautions in “For Your Safety” (0A-16 – A-19).• Be sure to read and follow the warnings for the battery on the section,“Notes on Batteries” (0H-9), before using the battery.