Canon EOS 1DS MARK II 9443A009 Instruction Manual (en)

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The date/time (back-up) battery’s service life is about 10 years. If the 
date/time is reset, replace the back-up battery with a new CR2025 
lithium battery as described below. 
1
Set the <
4
> switch to <
2
>
and remove the battery pack. 
¡
The back-up battery is on the ceiling of 
the battery compartment. 
2
Remove the back-up battery 
cover. 
¡
As shown in the diagram, loosen the 
screw to remove the cover. 
3
Remove the battery. 
4
Install a new back-up battery. 
¡
The plus side of the battery must face 
up. 
5
Attach the cover. 
¡
Install the battery and turn the <
4
>
switch to <
1
>. The date/time will be 
displayed on the LCD monitor. Set the 
the date/time. 
Replacing the Date/Time Battery
(+)