Battery for powershot

[gorja55]

Where do I find the battery that runs the time and clock in my power shot SX20 IS?

[Mykolas]

gorja55,

The date/time battery holder is located on the inside edge of the battery compartment in the battery tube nearest to the tripod mount.  To replace it, remove the batteries from the camera, then slide the holding tray out and install a new CR1220 lithium battery.

If this is a time sensitive-matter, additional support options are available at Contact Us.

[gorja55]

thank you. I saw that but the writing is so small was not sure if that was it or not. how often do you think a person should change these batteries?