Operation Manual

Installing the Batteries

Recycling Time and Flash Count

Battery Type Recycling Time Flash Count

Size-AA alkaline batteries Approx. 0.1-7.5 sec. Approx. 200-1400

• Use four new batteries of the same type. When replacing batteries, replace all

four batteries at one time.

• Size-AA lithium batteries can also be used.

• Although non-alkaline, manganese batteries may also be used, the number of

flashes will be less.

• Remove the batteries when the 420EX will not be used for an extended period.

• In low temperatures, take two sets of batteries and keep one set warm in a

pocket, etc., and use the batteries alternately.

• An external power pack cannot be used with the 420EX.

• The above specifications are based on Canon’s testing standards.

• Using size-AA nickel-hydride batteries will yield only about 70 to 80

percent of the flashes (1550 mAh at full output) obtainable with size-AA

alkaline batteries. The recycling time will also be about half the time with

size-AA alkaline batteries.

• To prevent faulty connections, make sure the battery contacts are clean. If

necessary, use a clean cloth to wipe the battery contacts.

• In the case of size-AA nickel-hydride and size-AA lithium batteries, the shape

of the contacts is not standardized. Be sure that the batteries are compatible

with the flash unit before buying.

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