Put it into the Power Save Mode, that's the best way to deal with this on these phones.
I tried with Power Save Mode at one point and was pushed 4 days with 9 hours screen time. (About 2 hours a day roughly.)
Cutting back on unnecessary social media consumption has been not only a breath of fresh air for myself, but also my phone.
I have an iPad and a laptop at home so the most this screen use is getting is light social media, Android Central, Messenger and texting. Off screen it gets lots of music playback and some phone calls.
During this test time I experienced no lag whatsoever and keep 4K resolution at all times. I see no battery difference between 1080 at all, but I di see how ugly it is. Lol
During this phase, standby drain was already substantially low prior to Power Save. With Power Save standby drain is practically non-existent. I wasted more battery checking everyday to see if dropped any percent. Overnight I'd lose just 1%.
I didn't get to try Power Save on this new battery yet. It's been performing well enough with a power cycle. This is the first time I'm trying to run down the phone to 0% for a power cycle. I'll report back right when it hits 1%.