When the clock battery failed, you had to program the date and time every time you turned on the scanner to get it to work. Uniden did a firmware update which would give you time to enter the date and time and then it would begin scanning without entering the date and time. If the scanner goes directly to scanning without stopping to enter the date and time and the date and time are current, the battery should be OK. If your scanner has the clock battery problem, tape a note to the scanner that it needs both the clock battery and dim display fixed.