Since the update, I have definitely experienced worse battery life, especially overnight on idle and also overall when I'm at home on WiFi, I have read a few posts about the November security patch causing worse battery on a lot of different phones so I don't know if it is because of that, I just hope either the December patch sorts it, or HMD make the battery optimisation better in the next update patch from them soon, has anyone else noticed worse battery performance since Oreo?
It seems to be more when I'm at home on WiFi and through the night on standby/idle that I have noticed a drop, but also after Oreo I have a RCS Phone app now showing in my battery usage which I have never since before I'm guessing it's Rich Communication Services and probably because of WhatApps, but that is the only thing that is different on the whole, Instagram is using a little more battery now to tho. But I'm gonna try a night of just 4G soon to see if it is a WiFi only issue.
Today after being 9 hours connected to Wifi and nearly 3 hours display on I still have 82% remaining
so there are no issues here at all.
So, after some hours on the Christmas Market my day is over, 12,5 hour after last charging, still 74% left.
I've Glance on for 20min and display on automatic brightness.
Charging last less than an hour till 100% with a third party Quick Charge 3,0 charger.
But I have my phone all night in a docking station connected to the charger.
If it takes longer to charge I assume there is something wrong with the charger, try a different cable or connect to a PC with a USB 3 slot.
Have been on Oreo 3 days now and not noticed any worsening of battery life compared to Nougat - which for me is better than my previous HTC 10 phone (Nougat).
For example yesterday, 13 hours after disconnecting from charger (at 100%) I had 69% remaining. This is with 1h11m screen time, about 90 mins of music through earphones and corporate email client running in Push mode for 9hrs, as well as a few other tasks running in non-optimised mode (e.g. whatsapp, Inbox etc). I dont use twitter,facebook etc.
Approx 1hr of the 1h11m was probably surfing the net. My phone is connected to Wifi when I am at my desk or at home - 3g/4g otherwise.