Battery Replacement for the Kindle 4 - iFixit Repair Guide
Amazon 53-014490 B07DLPWYB7 J9G29R Kindle 10th Kin Replacement Battery: BatteryClerk.com
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. :
How to Replace Your Amazon Kindle D01100 Battery - YouTube