These are the lowest voltages I ever saw from AS-1. But she’s still working – interesting :-)
Time in full sunlight after eclipse was less than 1 minute.
19:59 UTC hihi de ki4nqo aubiesat 1 vb 2r97 sk
20:01 UTC hihi de ki4nqo aubiesat 1 vb 2r92 sk
20:02 UTC hihi de ki4nqo aubiesat 1 vb 3r15 sk
21:31 UTC hihi de ki4nqo aubiesat 1 vb 3r04 sk (in eclipse)
21:32 UTC hihi de ki4nqo aubiesat 1 vb 3r02 sk
21:33 UTC hihi de ki4nqo aubiesat 1 vb 3r00 sk
21:34 UTC hihi de ki4nqo aubiesat 1 vb 2r97 sk
21:35 UTC hihi de ki4nqo aubiesat 1 vb 2r94 sk
From the timing of your observations and the statement that the satellite is coming into full sunlight from eclipse, it does not look like the battery is holding up very well anymore. The voltage is rising over 150 millivolts in a period of three minutes, plus the voltage readings are not continuously increasing, which would indicate tumbling to me and operation from different solar panels.
The commercial data sheet for the battery indicates a life of 500 cycles or so, and AS-1 has been through many more than that since last October. AS-1 is probably just running on power generated directly from the solar panels, and not much stored in the battery at this point. But, that is a guess at quite a distance just looking at the battery telemetry.
John, WB4LNM