Replacing The Date/Time Battery - Canon EOS 1D Instruction Manual

Replacing the Date/Time Battery

The date/time (back-up) battery's service life is about 5 years. If the
date/time dialog appears when the battery pack is replaced, replace the
lithium CR2025 battery with a new one.
The date/time setting will also be reset, so be sure to set the
correct date/time.
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Set the power switch to <2>
1
and remove the battery pack.
The back-up battery is on the ceiling
of the battery compartment.
Remove the back-up battery
2
cover.
Use a small screwdriver to loosen the
screw and remove the cover.
Be careful not to lose the cover and
screw.
Remove the battery.
3
Install a new back-up battery.
4
The plus side of the battery must face
up.
Attach the cover.
5