Replacing The Date/Time Battery - Canon EOS 5D Mark II Instruction Manual

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 you turn on the power and the date/
time is reset, replace the back-up battery with a new CR1616 lithium
battery as described below.
The date/time setting will also be reset, so be sure to set the
correct date/time (p.42).
For the date/time battery, be sure to use a CR1616 lithium battery.
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Set the power switch to <2>.
1
Unscrew the battery holder
2
screw.
Use a small Philips screwdriver.
Be careful not to lose the screw.
Take off the battery holder.
3
Push out the battery in direction
Replace the battery in the battery
4
holder.
Make sure the battery is in the proper
+ – orientation.
Tighten the battery holder screw.
5
.
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