From the manual, page 7, I found the note below.

If a power failure occurs or if the power
cord is disconnected, the scanner's
memory backup circuit keeps information
in memory for up to 3 days.

Note: The memory backup circuit begins
to protect memory within a few
minutes after you plug in the scanner.

The behavior described implies that a capacitor is used to backup memory,
not a battery. If you keep the radio plugged into a live AC outlet it should
retain memory when the radio is turned off.


"GeorgeF" wrote
I recenlty got a PRO-2045. Its working great and has been doing very
well for MilAir.

However it was turned off for about 48 hours, when I turned it back all
the channels were reset back to Zero. Anyone know if there is an
internal battery for memory?