External Power Sources - Canon SPEEDLIGHT 550EX Instructions Manual

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
Internal
Size-AA alkaline batteries × 4
Power
Sources
Transistor Pack E (Ni-Cd Pack TP)
External
Transistor Pack E
Power (Size-C alkaline batteries)
Sources
Compact Battery Pack CP-E2
(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.
12
Power Source
Recharging Time (sec.)
Quick Flash Normal Flash
Approx. 0.1 - 4 Approx. 0.1 - 8
Approx. 0.1 - 1.5 Approx. 0.1 - 3
Approx. 0.1 - 2 Approx. 0.1 - 5
Approx. 0.1 - 1.5 Approx. 0.1 - 5
Available Flashes
Approx. 100 - 700
Approx. 300 - 1800
Approx. 350 - 2200
Approx. 350 - 2200