this post was submitted on 16 Feb 2024
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This is extremely normal for any phones more than a couple years old. Wifi / cell network polling for messages uses a lot of battery, and I only remember my phone getting smarter about it around 2019? (Most phones now will detect you're inactive and poll network much less frequently overnight for example)
Normal stand-by drain is less than 1% per hour, for a new device or a phone from 2015. Something is very wrong for it to drain 35% overnight.
I no longer have a old phone but I found that disabling bluetooth and mobile data when your not using it can help with battery drain.
You can also go into developer settings and set the maximum backround process limit to 3 and that does a good bit on its own.