Canon A20 - Manual (Page 96)

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Appendix
The camera uses a special Date battery to
power its internal clock. If the LCD monitor
displays the Set Date/Time menu when
you turn on the camera, this means that
the Date battery has run down and the
clock has stopped running. Please
purchase a replacement battery (battery
type CR2016) and install it as follows.
Replacing the Date Battery
The date battery is preinstalled at the factory
and may therefore expire earlier than its rated
lifespan after the camera has been
purchased.
1
Be sure that the camera is
turned off.
2
Slide the CF card slot cover
in the direction of the gray
arrow, and open it.
3
Pull out the date battery
holder.