Batteries!

 When I set up my second hand Canon Powershot, I of course checked it, set the date and time and did some test shots.

What I didn't do was power it on and off and see if it held the date and time information. My bad.

So, it was a bit of a surprise when I came to use it and found the clock needed to be reset again. Actually it needed to be reset every damn time I turned it on - it turns out that the configuration memory has a little button battery to power it and this needs to be replaced every so often.

Now with an old camera, indeed an old anything, manufacturers do have a tendency to remove the documentation from their websites, invariably leading to some frantic googling of enthusiast sites.

Not so Canon - the documentation on replacing the time and date battery was online, and not only was it clear, the procedure was straightforward, just a matter of getting the correct battery from ebay, pulling out the old one, and hey presto - we were in business...