Yes,more than likely there is a little button cell battery that powers the date and time.You'll have to look in your manual to find its location.I just discovered my battery is dead.Yep i checked the manual even tho i already knew where to find it.Took some reading to find but it was there in the manal.Its located in the battery compartment on my canon A720IS.Mine takes a CR 1220 - 3Volt.I'm still trying to find a replacement.Guess i'll have to go to a camera store to get the battery.Couldn't find at any of the usall places.Hope this helps someone,Gary Malcontent
Greggehlen and gary,
i have the canon a720IS and was having similar problem with my date/time. once i discovered the small cr1220 battery next to the regular battery compartment, i replaced it but the problem still was there.
i looked closely at the cr1220 compartment and took a toothpick and just pulled the metal prongs out a bit, so that they were in better contact with the cr1220 battery. ever since then i've had no problems.
good luck.
chris c
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