Canon 550 EX - Manual (Page 11)

Installing Batteries
Recharging Time and Available Flashes
• The minimum recycling time applies in the E-TTL or TTL mode while the maximum recycling time
applies in the manual or full-output (1/1) mode.
• The minimum flash count applies in the manual or full-output (1/1) mode while the maximum
flash count applies in the E-TTL or TTL mode.
• 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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• 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 550EX 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.
Battery Type
Recharging Time
Available Flashes
Quick Flash Normal Flash
Size-AA alkaline
batteries
Approx. 0.1 - 4 sec. Approx. 0.1 - 8 sec. Approx. 100 to 700
• 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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