Replacing The Date/Time Battery - Canon EOS 350D Instruction Manual

Replacing the Date/Time Battery

The date/time (back-up) battery maintains the camera's date and time.
The battery's 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 CR2016
lithium battery as described below.
The date/time setting will also be reset, so you must set the
correct date/time.
(+)
For the date/time battery, be sure to use a CR2016 lithium battery.
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1
Set the power switch to <2>.
2
Open the cover and remove the
battery.
3
Take out the battery holder.
4
Replace the battery.
(–)
¡
5
Insert the battery holder and
close the cover.
Make sure the battery is in the proper
+ – orientation.