Amazon Kindle Paperwhite (2021) Review: A much-needed upgrade
A look inside a Signature Edition Paperwhite. The battery appears easy to replace and the back case was easy to remove with no damage to the Kindle using a plastic prybar. :
Original Replacement Battery 1420mAh For Amazon kindle Paperwhite 2 3 1 S2011 003 S MC 354775 03 MC 354775 05 Batteries|Mobile Phone Batteries| - AliExpress
Kindle Fire Battery Replacement - iFixit Repair Guide