How to replace the date/time (backup) battery in the EOS 1D Mark II, EOS 1D Mark II N, and EOS 1Ds Mark II.
Article ID: ART157568
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Date published: 06/09/2015
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Date last updated: 08/17/2015
Description
How to replace the date/time (backup) battery in the EOS 1D Mark II, EOS 1D Mark II N, and EOS 1Ds Mark II.
Solution
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 <> to <OFF> 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.
5. Attach the cover.
Install the battery and turn the <> switch to <ON>. The date/time will be displayed on the LCD monitor. Set the the date/time.
> to <OFF> and remove the battery pack.
