Canon A800 - Manual (Page 118)

118
The life of the date/time battery (back-up battery) is approximately 7 years. If
the Date/Time settings screen appears every time the camera is turned on,
replace the date/time battery with a new one (CR1220).
Turn off the camera.
Open the cover and remove the AA
batteries
(p. 12) .
Remove the date/time battery
holder.
Replace the battery.
z Insert the battery with (+) and (-) sides
oriented correctly.
Insert the battery holder.
Insert the batteries and close the
cover.
Turn on the camera and set the
date/time
(p. 15) .
Replacing the Date/Time Battery
(-)
(+)