Canon EOS 30D - Manual (Page 40)

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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.
1
Turn the <4> switch to <2>.
2
Remove the battery.
3
Take out the battery holder.
4
Replace the battery.
Make sure the battery is in the proper
+ – orientation.
5
Insert the battery holder.
Then load the battery and close the
cover.
Replacing the Date/Time Battery
( – ) ( + )
For the date/time battery, be sure to use a CR2016 lithium battery.