Peter

you *should* backup your preset anyway; you have 2 ways to do this:

-use Vsig editor on a PC and store them to the hard disk (best)

-use a PCMCIA card (worst)

The battery is soldered to the circuit. If the unit works well, the battery id fine.

When you start having all sort of warning/error messges, and frequent checksum errors messages…then the battery is about to go.

best

I