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I just use the moderate power saving mode which disables network traffic of the background apps. Now my 2017 Samsung A3's battery lasts about 3.5 - 4.5 days / charge. If I need to be "urgently" contacted people can still call or SMS me but I don't want any realtime notifications from apps.

Which API did you use to do this? I looked into this a while ago but it looked like Android wasn't allowing programmatic access to airplane mode.

That sounds great! What's the app called, I'd like to install it.