Signal is draining battery like crazy on Oreo. With 2 min screen time drain was like 500 mAh in 24h. Yesterday did one 30min call and it drained 1200 mAh. Similar experiences have been popping in the Signal Playstore feedback and Reddit.
That's weird. I'm on the October Oreo patch, rooted with EXKernel and I just checked my battery stats. Says I used voice call for one hour out of the day so far and it's used a total of 298mah.
Tried Signal beta, also tried disabling the battery optimization, no help. With signal beta and battery optimization on daily consumption is sometimes around 1000mAh with only some minutes screen time for Signal.