Agreed! Especially if you replace the batttery a second time with a less Apple-like adhesive.

To prepare for a third time I actually covered parts of the adhesive pads with plastic film on the new battery. I figured that gluing it to the base where it is actually hooked behind the frame makes little sense.

Cheers to everyone repairing good old things and keeping them alive!

I got the answer. Unfortunately, I broke the display. A magifying glass revealed that I have scratched the cable where I inserted the blade. Replacing the display and I fixed it!

The display came off nicely after heating the iOpener a couple of times and wiggling the blade a bit. Now i have replaced the battery and the force touch sensor an thought I was ready for a dry run. So I did not peel off the final layer of film so that I can still remove the display. What I see is not good, the display is full of stipes and pixles in many colors. So, did I break the display (e.g. by heat) or does it have to be completely glued to the sensor in order to work?