Canon A540 - Manual (Page 117)

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5
Remove the battery by pulling it up in the
direction indicated by the arrow.
6
Insert a new battery with the (–) side facing
up.
7
Replace the battery holder and close the
memory card slot/battery cover.
8
When the Date/Time menu appears, set the
date and time (Basic Guide p. 3).
After purchasing the camera and turning on the power for the
first time, although the Date/Time menu will appear, you do
not need to replace the date battery.
(–) Side