Poor battery life

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Android Central Question

Samsung note 9. I got this phone in part because of the top rated battery life, and at first it was. I could go a day and a half before getting low.

Now, the battery life drops like a rock tossed over a cliff. I did admittedly use the phone for a period of about a couple months streaming a LOT of videos, bcuz i had no other device to watch on. When i watched a lot of videos, the battery drained quickly, as expected. But now, the phone can be sitting in my pocket all day with the occasional Facebook or email check, texting, maybe a few youtube vids here and there, battery still drops like a rock. It lasts maybe half a day compared to the day and a half when it was new. Phone has no physical damage, no major drops or shattering (I have a heavy duty case) no water damage, hasn't been wet.

Things I've tried:
All the online advice.
Screen brightness is set below 25%.

Medium power save mode on. Battery optimized.

Every battery sucking app restricted to run in background, set to put to sleep when not in use.

I've gone thru apps and deleted anything suspicious or unnecessary.

Ran multiple virus scans with multiple different AV apps.

Restarted phone.

Downloaded any updates i can find.

Turned dark theme on wherever i can.

Probably a few more things i can't remember.

Things I have not tried:

Factory rest (which i absolutely dread and will only try as an absolute last resort)

Disabling mobile data. The phone is on wifi 95% of the time unless i leave to go somewhere, which generally doesn't take more than an hour or two. It was never a factor when the phone was brand new but suppose i could try airplane mode.

I've tried everything i can find on forums or google searches, short of factory reset. Could the battery life have been degraded this much from a couple months of running videos hard? The phone is not even a year old, probably 9 months, the battery life is cut in half and that's WITH all the steps I have taken above.

Is there something I'm missing? Anything else I can try not listed above? Could charging with the case on cause the battery life to take that much of a hit that quickly? Any ideas would be greatly appreciated. Thanks
 
So this is standard for note 9? This chart may not be reflective of it but there are times it'll drop 3 percent in the time it takes to type this message. I'm positive there has been a notable large dropoff in battery life since out of the box. No doubt in my mind whatsoever
 
So this is standard for note 9? This chart may not be reflective of it but there are times it'll drop 3 percent in the time it takes to type this message. I'm positive there has been a notable large dropoff in battery life since out of the box. No doubt in my mind whatsoever
You have in medium power saving mode , so you definitely supposed to be getting good battery life
You need to get it charged to 100 percent to reset the stats and wait until 20 percent take a screenshot get a better picture
 
Any app that shows you videos is going to suck up lots of power: Instagram, youtube, any web browser looking at pages showing videos.

Any app that has a white background will use less power if you manually switch it to dark/night mode.

Check the phone signal strength at locations where you spend lots of time. Weak signals will cause the phone to use more power to talk to the towers. At home and work, if you have the wifi-calling feature, you might give that a try if your phone signals are week.

If you have week signals, email apps and social media apps that constantly check for new posts will use more power than expected.
 
Thanks for the tips. I have addressed all of that except the mobile data. I do have a somewhat weak signal at home so have switched off mobile data to see if that helps.

Maybe I'm just expecting too much, maybe it's not as bad as I think. It doesn't seem to me to be near what it was out of the box, even with power save mode but I haven't monitored battery use long term, so I have nothing to compare to statistically
 

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