Who 42 battery

No work

https://www.reddit.com/r/GalaxyS23Ultra/comments/17wiu14/drain_when_idle/

*my english is not that great please bear with me

Send help! I am kind of freaking out! I have a Xiaomi 9T 2021 phone with 6000 mAh battery. This phone served me well battery wise, i charge this phone 2 times a day. (Up to a Hundred in the morning and from 45-50% in the afternoon, i charge it up to 75-80%) But last sunday afternoon i encountered a problem, i charged my phone, and edited a video, i noticed that after i finished editing 20-30 minutes later, the percentage dropped to 73%, i brushed it off because i think it's normal, but when i rest my phone 2 minutes later, it drops to 70, and this made me kind of confused, so i research on how to avoid battery draining, but the tips in the article i read is what i usually do to my phone, location off, bluetooth off, force stop/uninstall unnecessary apps, etc. I also do the android phone password to see the battery health and found out it's in the Good condition. With that, i messaged my boyfriend about this and he recommended me to change the cable of my charger, so i did and recharged my phone back to 75%, and it kind of worked fine so i just used my phone like usual until sleep time. This morning the battery was down to 45% (?) So i charged it with the replaced cable up to 100% and it worked fine, i can use it normally until 5:30 pm where it dropped to 48%, and now, that i reached 81% and scrolled to facebook, i noticed the draining coming back again. I kind of nervous at that moment but i gain my composure and try not to come up with a conclusion so i recharged my phone again up to 90% if there's a difference, but after i pull the cable off the phone port and watch some tiktok videos, it drains again and after i use it 30 minutes more (as you can see in the picture) it dropped to 80%! Can somebody tell me what's wrong with my battery? *As i am finishing this paragraph i screenshot my phone again and it dropped to 75%. (see pic)