It is a Huawei P8 have it since 2017. Is it normal that the battery then loses power?
I'm lucky if I have 10-20 minutes until the battery goes down.
Or it goes down immediately from 100% to zero.
Can it be that my phone is broken?
Battery probably charged too often, buy new battery / cellphone
The battery is probably defective. Normally, the battery should last 2 years until it loses power. In your case, that's unusual.
It's best to replace the battery in a qualified store.
As the others write the battery is broken
Batteries can be used about 750 to 1100 times. Then replacement must be pure
I have already sent my 2x. But you can also look in the internet… Broken cell phone…
I was very satisfied with lower company. But 1 week without mobile
https://www.letsfix.de/Handy-Reparatur/
