Here are the photos I took last night while disassembling the bloated K2 battery pack (all converted to 600x600 or less, before uploading to my mobileread photo album):
Top of label peeled loose. That torn tab was there already, from the battery swelling (which also damaged the kindle case).
Flipped over so the back label of the plastic wrapper is visible.
Peeled and naked. Not easy to get the tabs started. I should have waited to trim my fingernails until AFTER peeling this wrapper, eh? This time I did not use a knife to start the corners, like that punctured PW2 battery I did previously...
Plastic frame flipped up so you can see how the LiPo battery fits inside the pack.
Opened up. There is more ink on the adhesive than remains on the LiPo battery.
A closeup of the internal LiPo battery labelling (what was left after peeling off the aluminum sheets). And you can see how inflated that foil pack is too.
Those metal tabls should be fairly easy to cut close to the battery, with a pair of heavy-duty scissors.
That kapton tape is pretty thoroughly bonded to the cloth, so I did not peel it off any more than you see here.
As you can see, the K2 battery packs have four terminals, unlike newer kindle batteries that have only three terminals. Perhaps they switched from
i2c to
1-wire protocol?
The aluminum sheets that cover the front and back of the battery pack (under the label) probably contain and distribute the battery heat so that the circuit board can more accurately measure it, for safe charging. This must be taken into consideration for any replacement LiPo cell as well, for safety. Those sheets are about the same thickness as aluminum soda (or beer) cans, so replacements could easily be made from such salvaged aluminum.
EDIT: I wonder how you are supposed to type that URL for the wikipedia "i2c" page. Click that link to see the URL in the web browser title bar. On my browser, I see a superscript '2' character (even when I hover over the link in my web browser). Using hard-to-type characters in a URL is not user-friendly -- especially on an older smartphone that does not display such superscript characters...