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I will test it tonight with VoLTE off.

Could you please test if it make any difference over night, if you turn VoLTE temporarily OFF? Just to test if VoLTE is somehow part of the issue. (I know turning VoLTE off will not be a solution, for carriers that shut down their 3G services. So just a test)

Just to be clear, I wasn't suggesting not using a Pro 1 as a phone should be a solution for anyone. However, my defect led me to a diagnosis of the possible problem with Airplane Mode being a test. 🙂 I'm just lucky my problem doesn't affect me much because I happen to be weird.

HI, the Lineage Juli Update maybe improved the battery drainage a little bit. Instead of going down from 100% to 30% during the night (meaning, the Pro1 was at standby and "Do not disturb" was activated) my Pro1 was emptying the battery to only 50%. Slight improvement, but still to much to use it during the day at work and so on. Last night I had "Airplane Mode" on and Wifi on too.  VoLTE (4G-Anrufe in the phone localized to a German UI) was on. The battery was going down from 100% to 93%. This is approximately, what I had in the past before the update of Lineage to version 22.2. I switched Airplane mode of today morning and after 5 hours the battery was down to 60%. This shows, that @Hook is probably right with his assumption, that the battery drainage is related to the SIM card respectively to the phone call functionality.  But Airplane mode is no solution for me, because I am using the Pro1 not only as little computer, but also as a mobile phone. 😢

Yes, my VoLTE was ON.