Canon 550EX - Manual (Page 12)

2. External Power Sources
Speedlite 550EX can use any of the following two external power sources.
For details, refer to the Instructions of the respective external power source.
(1) Transistor Pack E
Uses Canon Battery Magazine TP (six size-C alkaline R14 batteries) or
Ni-Cd Pack TP.
(2) Compact Battery Pack CP-E2
Uses six size-AA alkaline LR6 or Ni-Cd batteries.
Size-AA lithium (FR6) batteries can also be used.
Recharging Time and Available Flashes
Power Source
Recharging Tim e (sec.)
Available Ftashea
Q uick Flash Norm al Flash
Internal
Size-AA alkaline LR6/AM -3 batteries x 4 Approx 0 1 - 4 Approx, 0 1-8 Approx 100 - 700
Sources Size-AA Nicad KR15/51 batteries x 4 Approx 0 1 - 2 5 Approx 0 1 - 5 Approx 40 - 300
Transistor Pack E (Ni-Cd Pack TP) Approx 0 1 - 1 5 Approx 0 1-3 Approx 300 - 1800
External
Transistor Pack E (LR14/AM -2) Approx 0 1-2 Approx 0 1-5 Approx 350 - 2200
Sources
Com pact Battery Pack CP-E2 (LR6/AM -3) Approx, 0 1 - 1 5 Approx 0 1 - 5 Approx 350 - 2200
Com pact Battery Pack CP-E2 (KR15/51) Approx 0 1-1 Approx 0 1-2 Approx 130 • 900
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While High-Voltage Pack E315's main switch is still on, do not clean the connector
plug with water or a metal pin and do not touch the plug.
Even when an external power source is used, batteries must be installed in the 550EX
to power the internal circuitry.
The 550EX uses both the internal and external power sources to recharge the flash.
Therefore, the internal power source may become exhausted sooner than the external
power source. For prolonged flash photography, keep a spare set of batteries handy
for the internal power source.
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