Just saw the yt video, these are very nice 😀 kudos!

Thank you very much! Hope this will be helpful for the one or another.

Nice work, but it's worth mentioning the DS12887A is still being made in great numbers. I recently bought one and it came with a 2119 date code. I realize that it may not be compatible in all situations and the replaceable battery is nice, though.

Ok, thanks, good to know. I just bought in China three times, they were all dead. Then I was tired of it and got five in Germany from a big official distributor, sold as new for 10€ each. Turned out, that it was old stock as well. One was dead on arrival, one died after 6 months, the others after a year. May be there are some new indeed out there, which you can buy, but I just had no luck to find one. However, now I have enough of them in different variants 😁

tag! going to build one and try in a system that did NOT work with a DS12887+ but did work with an Odin OEC12C887 and see what it does

Yes, even if those modules are actually identical and many boards do work with both, there are some mainboards, which are picky about it. I think, it's something about timings. I even had once two Odin OEC12C887, where one worked in a mainboard and another one not. Both modules were ok and did work in another mainboard though. I have a feeling, that Odin used different RTC ICs in the same module version internally. Probably to keep the costs low, but the side effect was, that the timings were not quite inline. And some mainboards probably relied too much on particular timings.