Replacing The Date/Time Battery - Canon EOS 30D Instruction Manual

Replacing the Date/Time Battery
The date/time (back-up) battery maintains the camera's date and time
and 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 CR2016
lithium battery as described below.
The date/time setting will also be reset, so you must set the
correct date/time.
Turn the
<~>
switch to
<OFF>.
(-) (+)
Remove the battery.
Take out the battery holder.
Replace the battery.
Make sure the battery is in the proper
+ -
orientation.
Insert the battery holder.
Then load the battery and close the
cover.
-- For the date/time battery, be sure to use a CR2016 lithium battery.
40