You're maybe too busy with the new A9iii to worry about A1 battery drain right now
I'm really interested in the results from whoever can do it. It will help get to the real world issue. There are two possibilities....
1 - FW2.0 is draining the battery faster than 1.32 with auto power save 'off' in the static test as per my post above. This would be the simple linear result easily reportable to Sony.
2- There's none or very little difference in the static test. This would point to an issue with auto power save (usually set to 1 minute for me) but hard to simulate in a test.
Scenario 2 points to something changed with auto power save like EVF sensitivity has changed and its not behaving like it used to. In the real world there are two of us shooting together using '1 miunute' auto power save' and, for both of us, it doesnt seem to be happening at 1 minute all of the time for some unknown reason.
btw - I think you posted about what appears to be compulspry to download CR_AP. This caught me out when I got the 'download and use CR_AP' message on the A1 so I did it all. Second time around I noticed you can bypass it by pressing the delete button and carry on as usual without any need to take any CR_AP. It's really sneaky how Sony have hidden this option with a big full screen message about how we need CR_AP.