Does any body has experience how to change battery?

The batteries spare part number is N4FUYYYY0049 and you can find a panasonic service manual using google.It says that the camera has to be disassmbled completely for battery access.Asking a official german Panasonic service center the cost for a battery change will be about 190€ without postage !!!!!

This is an absolute nogo for my and I won`t buy this camera

I have the phone.
You need a hair dryer an ISesamo and some picks to get into the phone.
You need to heat up the display and then carefully lift the glass on the top right corner.
A sucction cup could be good too !

Carefully cut the adhesive with plastic picks and cut all around the display. Take some extra time
on the bottom end, it’s glued down pretty well. Except for the glass or the display you can’t
damage much in this process, because everything is well protected. Still use a plastic tool though.
When the display is loose, carefully lift it up a bit and disconnect it.

The rest is relatively selfexplanatory.