Absolutely not. That's what I can't understand. It seems my kindle did a lot of things it shouldn't have.
As seen here
https://www.mobileread.com/forums/sh...=261999&page=2
The battery should fix itself when I will manage to unbrick the unit.
I will try again to enter recovery. Maybe I will use another terminal emulator. I used putty because it's what I use at work, but since I use Linux at home, I'd better use minicom.