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Installing the Batteries
[J] •
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.
-- • 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.
Recycling Time and Flash Count
Battery Type
Recycling Time
Flash Count
Size-AA alkaline batteries
Approx. 0.1-7.5 sec.
Approx.200-1400
• 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.
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