User guide

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.

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.