This backup battery allows the camcorder to retain the date and time and other settings when the main power source is removed. It has a life span of about a year.

When it needs replacing (or if it has not been installed), the mark flashes in the display. Remove the old battery by pushing it up, releasing and lifting it out. Make sure to attach a power source to the camcorder first, so it will retain your chosen settings when you change the battery.