HP 41CX Auto-Off behavior

[do2]

Following the lead of Sylvain, I checked the auto-off timings of my 2 HP-41's in a more scientific way. Please note that I clocked the timings per hand, so the accuracy should be around +/-1s.

And I took a series of 3 measurements in a row, with the first one immediately after a cold start:

HP-41c from 1982: 9:28/9:29/9:30
HP-41cx, Halfnut from 1987: 6:15/6:27/6:28

After a couple of days, I clocked the following timings for the Halfnut (first one again with a cold start):

HP-41cx, Halfnut from 1987: 6:23/6:24/6:25

From these results and without knowing the schematics, one would have suspected an electrolytic cap in play here. Nothing new for those who already know. But it's a little bit like unlocking a small secret in a game, even if it's not necessary for the main campaign...