> > Does the Z12 have an internal memory backup battery?
Yes, there are two lithium thionyl chloride cells, Tadiran TL-5104. They are 3.6 V primary cells, cylinders roughly AA in size, with spot-welded axial leads. That part is obsolete, but Digikey has an equivalent, TL-5903/P, which worked fine for me. They're easy enough to replace, but the inside of the box is a little awkward, with multiple board levels, screws, and hinges. Clip the spent cells free of their leads to make the desoldering a little easier and to reduce the risk of heating the cells (the chemistry is hazardous). There is also some foam double-sided tape helping to hold the cells in place; will need to replace that as well. The two cells are wired in a diode-OR, so a single cell will also work (for half as long). While I was waiting for the shipment, I used a single lithium coin cell, 3.0 V, to tide the box over, which also worked fine. Cheers, Peter _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.