Huawei Mate 20 pro no longer charges?

I have no idea what is going on, I want to charge it 100 percent this morning until I notice after 30 minutes that 88 percent is still broken on the cell phone or it could be due to the charging cable

Test another charging cable (girlfriend, mate, family). If it is not, then save the data and, if necessary, look for a new battery (approx. 30 EUR). If that's not the case, use the data backup to move to a new cell phone.

I've only had the cell phone for 3 weeks. You can replace the cell phone with the battery

Maybe that's because of an attitude?

Because you should never fully charge or discharge the cell phone as this damages the battery

You should try to keep your cell phone at a battery level between 30 and 80%, because the battery "works best" in this area

Yes, it's either the device or the cable. But you can't really tell from a distance. Only a test with another cable can help.

According to this report, the battery is NOT interchangeable:
https://www.giga.de/...lle-infos/

https://www.korrekturen.de/forum.pl/md/read/id/12207/sbj/gibt-es-wirklich-er-ladet/

I always charge it to 100% because when I listen to music or watch films on the go it also draws electricity

I just tried it on the train and it loads really strange again