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 batteries) or Ni-Cd Pack TP.

(2)Compact Battery Pack CP-E2

Uses six size-AA alkaline or nickel-hydride batteries. Size-AA lithium batteries can also be used.

Recharging Time and Available Flashes

 

Power Source

Recharging Time (sec.)

Available Flashes

 

 

 

 

 

Quick Flash

Normal Flash

 

 

 

 

 

 

Internal

Size-AA alkaline batteries 4

Approx. 0.1 - 4

Approx. 0.1 - 8

Approx. 100 - 700

Power

Sources

 

 

 

 

 

Transistor Pack E (Ni-Cd Pack TP)

Approx. 0.1 - 1.5

Approx. 0.1 - 3

Approx. 300 - 1800

External

 

 

 

 

Transistor Pack E

Approx. 0.1 - 2

Approx. 0.1 - 5

Approx. 350 - 2200

Power

(Size-C alkaline batteries)

 

 

 

Sources

 

 

 

 

Compact Battery Pack CP-E2

Approx. 0.1 - 1.5

Approx. 0.1 - 5

Approx. 350 - 2200

 

 

(Size-AA alkaline batteries)

 

 

 

 

 

 

 

 

 

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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Canon 550EX manual External Power Sources