I noticed today my battery only lasted 1.5 days, used to be 2.5 days... Rogers released a security update yesterday and it's no good.
Ensuring you have enough battery life to last the day is important so I can imagine how frustrating it is to be dealing with this battery drain, all of a sudden.
We are not aware of any issues specific to the Note 9. Sometimes existing applications on the phone may not be performing properly with the new software and need to be updated/reinstalled. There should also be a battery monitor in Settings > Battery > Battery Usage that should display high usage apps.
Once you've determined if there is a specific App causing the drain you can take action.
Let the Community know how things go! =)
@RogersTony having the issue again! for the like almost month, I barely get a full=day out of the battery! Only have like 10-12 stable apps on my phone E.g. Instagram/spotify/messager/Whatsapp/youtube/myRogers....
i see Android pie (9.0) is coming Feb 11th next Monday will this speed/fixup things on the phone?
It's disappointing that you've been experiencing these issues for almost a month already. =(
I use a Note 9 and often get almost 2.5 days on a full charge. I do tend to keep mid-power saver mode on with the brightness low to conserve power, so my usage may not be the same as yours.
You can find the changelogs for Android Pie by clicking here. There is a section specifically related to the Adaptive Battery feature that may relate specifically to the issues you've been experiencing. It looks like it will improve on Battery life! While it is based on each person's usage habits it seems promising you will notice an improvement with Android Pie.
I hope this helps!