kdf
I also upgraded to a Pixel 8a and the battery lasts waaaaaay less than on the previous Pixel 5 and 6a (with the same apps installed and same global usage), but I can get like roughly 2 days out of it, with moderate usage (no heavy usage like gaming or watching long videos, but rather short ones, music, mails, some phone calls, instant messaging). If I have the Private Space (were I have Google Services and some banking and ride apps) unlocked, then the battery drops even quicker.
I am not able to trust the battery usage report in the settings anymore, as I don't find it accurate regarding what uses the most battery. In my case, for the last days, it says the WiFi used 90% of the battery, when it was used for maybe an hour in the last 2 days. I connect to WiFi only at home and when needing data connection on the phone (most of the time when I'm at home I use the PC and not the phone so much) and in the rest of the time I am on LTE or no connection.
words Are you using 5G?
Didn't see any difference regarding battery usage when I was using 5G and now when I am on LTE. So I'm not sure it really has that much of an impact on battery usage (I'm not saying it doesn't have at all, just not perceivable).
kdf Also I restored from a P4xl seedvault backup. Would this have an effect ?
Seedvault backups don't seem to be reliable, as many people stated in the forum and from personal experience.
When I had to migrate to the Pixel 8a, I set up everything from scratch.
Maybe you should try to reset it and see if the battery usage changes.
If you go that route, please report back.