My STTNG had factory settings reset. I had a few gremlins to tend to so I ignored it over a few weeks. Just added credits each time I wanted to test out a repair. I figured the batteries were dead as I hadn’t changed them in a while. Today I grabbed the remote battery holder and it looked like this. I tossed the holder, put a new one in and good to go. Board is fresh as a daisy. Definitely saved me weeks of downtime and hundreds of dollars had that battery leaked on the board . You have been warned to check your batteries and get them off your boards.
BTW, Duracell batteries suck large

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NVRAM is great, but would have required desoldering of the RAM and soldering in a socket in this wpc89 board