Thanks for the article :)
I changed the battery and the daughterboard at the same time :)
Works like a charm.
Though i had some troubles opening the phone.
I think the picks are a bit too thick to get under, so had to use the blade of a utlity knife to get the first lift to the glass.
Especially that with one hand i am pulling and with one hand im holding the phone, so needed to be tricky to get under :)
But thanks to your guide all works now :)