Canon 420EX - Manual (Page 11)

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
Size-AA Ni-Cd batteries Approx 0 1-45 sec Approx 80-600
The above data is based on Canon's standard tests with new batteries.
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Battery Cautions
• Use four new batteries of the same type.
• When replacing the batteries, replace all four batteries at one time.
• 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.
• To prevent a faulty connection, make sure the battery contacts are clean. Use
a clean cloth to wipe the battery contacts before installing the batteries.
• Although ordinary, non-alkaline batteries may be used, the number of flashes
will be less.
• Size-AA nickel-hydride or lithium batteries can also be used.
• The shape of the Ni-Cd, nickel-hydride, and lithium battery contacts is not
standardized. Before buying these batteries, make sure the battery contacts
can properly touch the battery chamber's contacts,
• An external power pack cannot be used with the 420EX.
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