Look at the picture I posted. It says when it was manufactured

It is fine now. I even watched YouTube 1% for like 5-10 minutes in the morning. When I went to sleep the battery was 10% (low power mode, mobile data enabled) as for now I see nothing wrong with my battery after I restored the system.
The issue is solved now. I'm not going to buy a new battery for now, because I haven't had any issues for days now. Once again, I have Sony Xperia L from 2013 and this battery is also lithium. I have Nokia music Xpress 5320, which is ten years old and the batteries last fine.
I've never replaced the batteries on those phones. So if anything happens I blame Apple.

Lets not forget that Apple products are more expensive than other (better products). I saw a PC with 40GB of Ram and Xeon processor and it was cheaper than the current Mac Pro.

I'm not buying Apple products anymore nor giving money to Apple. I've looked around and there are so many better phones, computers for cheaper price and Windows can use all the programs I need (Photoshop, Unity, which I use for my work)
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For your information I gave up on materialistic life awhile ago. Why? Because I have to move a lot and it's stressful to move when you have lots of stuff.
I also gave up on having a car and haven't had it for 5 years now. Why? Because of the car tax.
Of course Android has bad phones. Of course Android has many flaws, but so does Apple. I am talking that there are many better products at Apple's price range and I'm not talking about Samsung.
The main point is: The issue has resolved itself for now and my battery lasts just fine. Thank you for your help. The only device I've had problems with the battery was my MacBook (early 2008) and it seemed like it'll blow up and. I didn't blame Apple. For sure the battery is old.
If the problem occurs again I might thinking of changing the battery. We'll see. And by the way about the batteries: Even brand new batteries can explode. It's the game of luck, really. There just was a video how iPhone X battery exploded at the store, of course the man bit into the phone, but yeah…
How come everyone trusts Battery Coconut on cycles and not my battery health, manufactural date etc…? You are as stubborn as me and see what you want to see. Yes, I am stubborn. I've generally had good experiences with all the batteries in my devices.
My iPod was manufactured in 2007 and the battery still lasts. Of course, I went to the Apple Store asking if they could replace the battery and they told me "no", but still, my iPod nano lasts full day, but I remember the times when it lasted a lot more.
Anything that has a battery in it might blow up.