Hog II battery?

We've got a Hog II board that's been dumping the show out of its memory whenever it starts up. We also have to re-adjust contrast and re-calibrate touchscreens each time as well. It seems like the CMOS battery is finally going as leaving it on to charge said battery no longer alleviates the issue. Internet info on the Varta Mempac battery is spotty at best...anyone ever have to replace this?

--nick--
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