Canon 5D Mark III User Manual (en)

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The date/time (backup) battery maintains the camera’s date and time. 
Its service life is approx. 5 years. If the date/time is reset when camera 
is turned on, follow the procedure below to replace the backup battery 
with a new CR1616 lithium battery.
The date/time/zone setting will also be reset, so be sure to set the 
correct date/time/zone 
(p.36).
1
Set the power switch to <2>.
2
Unscrew the battery holder 
screw.
 
Use a small Phillips screwdriver.
 
Be careful not to lose the screw.
3
Take off the battery holder.
 
Push out the battery as shown by 
arrow 2.
4
Replace the battery in the battery 
holder.
 
Make sure the new battery is in the 
proper + – orientation.
5
Tighten the battery holder’s 
screw.
Replacing the Date/Time Battery
For the date/time battery, be sure to use a CR1616 lithium battery.