Canon 2011B002 EOS-1Ds Mark III Instruction Manual - Page 188
Replacing the Date/Time Battery
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Replacing the Date/Time Battery The date/time (back-up) battery maintains the camera's date and time. Its service life is about 5 years. If the date/time is reset when the battery is replaced, replace the back-up battery with a new CR2025 lithium battery as described below. The date/time setting will also be reset, so be sure to set the correct date/time. 1 Set the power switch to and remove the battery pack. The back-up battery is on the ceiling of the battery compartment. 2 Remove the back-up battery cover. Use a small screwdriver to loosen the screw and remove the cover. Be careful not to lose the cover and screw. 3 Remove the battery. (+) 4 Install a new back-up battery. The plus side of the battery must face up. 5 Attach the cover. For the date/time battery, be sure to use a CR2025 lithium battery. 188