FP4: Battery drain (in flight mode) is substantial

• /e/ version: 2.1-t-20240603406607-stable-FP4
• Device model(s): FP4
• Developer mode enabled: yes
• Device rooted: no
• Trackers blocker enabled: ?

Summary

Battery drains too quickly. I have a few months old FP4. With plain /e/ OS (without any additional apps) I've turned on flight-mode and left the phone laying 24h. It drained 10% of battery.

If I do this with my 6-years-old Sony Xperia XA2 with plain LineageOS 20/21, it drains 1% in 24h. XA2 also drains less during the day when I use it.

There has to be something in the core OS (drivers? sensors?) draining the battery when the phone is idle. I've also tried to turn off sensors manually (Sensors OFF configuration). But It didn't have any effect on the drain. It did not even switched off fingerprint sensor. But before configuring fingerprints the battery drain was the same anyway.

The problem

Steps to reproduce

Set FP4 to flight-mode and leave it laying. Pick it up in 24h and observe battery state.

What is the current behavior?

It drains 10%.

What is the expected correct behavior?

I believe it should drain less, around 1%.

Technical informations

I'll gladly provide logs, install apps to measure and log battery things. Please let me know, what to do :)

In the future I plan to borrow FP4 from my dad (he has original Andorid there) and do the flight-mode test. Will share results.