Canon EOS Rebel XT - Manual (Page 38)

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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.
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.
¡ Make sure the battery is in the proper
+ – orientation.
5 Insert the battery holder and
close the cover.
Replacing the Date/Time Battery
(–) (+)
For the date/time battery, be sure to use a CR2016 lithium battery.