From 100 to 20% in 1 day, 10 hours, 51 minutes and 43 seconds.
Screen usage 3 hours, 9 minutes and 49 seconds, of which the majority on Facebook and Whatsapp, with WiFi, LTE and Bluetooth always active and Mi Band 3 connected.
I do not know what standard you are used to, but for a phone with a 6.39 “SuperAMOLED screen” it is a very good result.
The test was simple: “take the phone to work”. And I work with Socials. So the phones are under stress with all their functions plus power consuming: photos, videos, uploads and so on.
For me, proof passed.
I reserve a second trial in an even more challenging context, during a live event.