[Renate]

My battery has giving up the ghost.
I had some battery from some Motorola phone.
It's about the same W x H, but it's a bit thick.
I transferred the old BMS PCB with the mezzanine connector.
I put it all back inside my bookcover without the back cover since it's thicker.
This will keep me reading at least.

Even though I was careful the power switch flex was all glued under and it's become wonky at the switch end.

The battery is CLP255875
They have them in China but they are quoting end of August!

The nominal dimensions are 2.5 x 58 x 75 mm.
2.5 mm makes it "ultra thin". There aren't a lot of batteries in this thickness.
I can't seem to even find the raw cells.