This is not pure HP...
I had to finally replace my battery in my port-x-tender after 20 years of service. I have many modules in it. One with memory.
I read back 1 year in the archives and saw no postings concerning them, and the museum pages only mention it in passing. Great site BTW.
Anybody else have one of these?
CJ
I think it's a testament to
a) the life of these batteries
b) HP's good design to make memory modules when they did using as little power to retain memory as they did (and still do).
Incidentally, my port extender uses that same sort of batteries as one of my (old) cameras. These cameras are powered all the time. The battery is used for the meter and the automatic setting of aperture. These batteries are widely known to last between 10 and 15 years in these cameras.