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. :
Helyettesítő akku Kindle Paperwhite 2013 csak típ. 58-000008
How to Replace Your Amazon Kindle Paperwhite 2 Battery - YouTube
Helyettesítő akku Kindle Paperwhite 2013 csak típ. 58-000008
How to Replace Your Amazon Kindle Paperwhite 3rd Generation Battery - YouTube