Canon EOS 1D Mark II Instruction Manual page 168

Major Accessories (Optional)
168
Ni-MH Pack NP-E3
Dedicated, high-capacity power pack. Rated voltage of
12 V. It can be recharged up to 500 times. When fully
charged, it enables the camera to take up to about 1200
shots at normal temperature.
Ni-MH Charger NC-E2
Quick charger dedicated to the Ni-MH Pack NP-E3.
Excess charging prevented. It takes about 120 minutes to
recharge one pack. Two packs can be attached to it at
one time. The discharge function takes about 8.5 hours to
cancel the pack's memory effect. It runs on 100 - 240
VAC.
Shoe-mount Speedlites
Flash photography with an EX-series Speedlite is as easy
as normal auto exposure shooting without flash. All EX-
series Speedlites enable E-TTL II autoflash, high-speed
sync (FP flash), and FE lock. With the 550EX, an easy-to-
use, wireless E-TTL II autoflash system is possible with
multiple Speedlites.
Macro Ring Lites
The EX-series Macro Lites are ideal for close-up flash
photography.
You can fire only one or both flash tubes and control the
flash ratio to easily obtain sophisticated lighting effects
with E-TTL II autoflash. Also, high-speed sync (FP flash),
FE lock, and a multi-Speedlite, wireless system (with
550EX or 420EX as a slave) are possible to achieve
various macro flash effects.