So, I've hand this device with the weirdly complicated name spelling for a while now. But I haven't used it as my main phone since recently because I first wanted to flash a different OS onto it. I didn't have the capacity/time to take care of that among other reasons because it's something that I've rarely done, and never before successfully. After several failed attempts to get /e/OS to run on it, I've now settled fore LineageOS. Since I want to use it as my main phone from now on I don't think I'll experiment with any other systems on it for now, even though it would be the perfect phone to get some experience with Ubuntu Touch, Sailfish or some other Linux Distro.
The last time I've written about this device it looked like the battery was affected too much by having been empty for years, notz even allowing the phone to charge its own battery. Android suddenly shut down seemingly randomly and had 3 to 20 % battery when turning it back on minutes later evewn though it displayed 30 to 50 % when it turned off. Sometimes it displayed a higher battery charge after turning back on than when it turned itself off. Sometimes it would last less than five hours usage before it went down. This became better over time. It seems that Android became better at guessing the current battery charge. Now on LineageOS the battery doesn't last a whole day when it's used a lot, but so far it didn't do any surprise jumps or shutdowns.