Well Folks, it took so time to arrange enough time do finish this project. To make the things complete, lets focus also the last step of change the battery:
First of all disconnect the Battery:
I decided to dismatle also the screen - but just do it partly, to enable straight workforces in line to the fragile screen.
You can use a small screwdriver, to loosen these plastic dips
Then move slowlely down again the long side of the device. After about 3cm you feel a restistance (this is the next plastic bit). Stop there, and turn around slightly the cc or spatula, to uplift the bit, an you can continue like that the whole long side down. But Attention: See the figure below. Do not try to remove the screen completely, just 2/3 parts will be enough to give you enough space to work (otherwise you run into troubles with electronics.)
Dismatled frame from bottom cover and screen. You can see the battery glued to the screen. On top ist the frame with holds the electronic and the back cover.
As mentioned already above, dont try to to remove screen completly. I fixed the space with pens and after with two clothespins,
I used a steel wire 0.4mm - could also be thinner (0.2-0.3mm) to make work relaxed and faster - but NOT TO CUT old battery = HAZARDOUS!
Close up of working progress:
Even try to work in both directions: Top Down, Insinde Up with the steel wire, due to the Glue spots. but even everything on the layer of screen:
And then the old one ist off.
Get as much you can of the cabelings from the connector:
Put connector and battery together with the new battery an some isolation around:
Put it back in the device - bottom of new battery with some double side adhesive band, put it all together and have fun with you new PocketBook.
...as long, as no new issues might happen.
Regards and thank you for you help and all of you cointributions.
Matthias