As the battery of my FP1(U) seems to be bloated I’m looking for an other one to keep my phone running 
If you want to sell a new or used but still well functioning, I would be happy to receive a message!
I don’t know why I am not able to send personal messages yet, but I’ve read your post @Enrico_Danzi or @Aennekin - is one of your batterys still available?