You may need to change the CR1220 batteries of your camera
It's usually because you need to change the internal battery for a new one, very easily located next to the battery port, directly underneath pull it up and replace it with a new CR1220 and replace the batteries too just to be on the safe side
SOURCE: camera will not retain time setting
Firts check the state of the litium battery, this is locate near the Audio/video port in your camera, with small flat screw driver you will be able to remove it. If the same situation occur after replacing the litium battery and i'm assuming the unit had never be open before unfortunately your camera needs new main board ass'y. But if the case is that some one open the unit before check for a loose conector from the litium unit to the main board.
SOURCE: Camera keeps forgetting the date.
This can be because the camera system battery usually a CR2030 needs replacement. Check in the manual where it is located
SOURCE: Canon PowerShot A80 loses date/time settings when turned off
The camera has a watch battery inside that has expired. Many of the Canon Powershots have external access doors for replacement of this battery. Unfortunately though for the A80 it's not easy to replace. It's buried deep inside the camera behind the card reader slot. It can be viewed on page 4 of the following disassembly of a very similar A95:
http://qman.fotokala.ee/Kaamerad/PowerShotA95/index.html
Due to the complexity of accessing the battery, do NOT recommend that you try replacement yourself. Instead recommend that you continue to bypass on startup.
SOURCE: everytime I turn the camera on the time and date
There are two batteries in the camera. One is the big one you charge and the other is a little coin type battery. This coin battery maintains your settings and when it goes your camera forgets things. Same setup on computers and a lot of other electronics. In your camera the battery is a CR1220 worth about $1-$2. It should last about 3-5 years but you never know.
The battery is in a little holder on the left hand side of the camera. Its under the same cover as the usb connector and power plug in. You should be able to pop out the battery holder fairly easily. This is one of those things that if you take the camera to a battery store they will probably do it for you if they aren't busy. If you look at page 137 of your manual you will find the instructions for doing it yourself.
SOURCE: every time I set the date/time on my camera and
Replace the date/time battery on the side of the camera.
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