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. :
Kindle Paperwhite Essentials Bundle con Kindle Paperwhite Signature Edition (32 GB, senza pubblicità), Custodia Amazon in sughero resistente all'acqua e Base di ricarica wireless : Amazon.it: Altro
How to Replace Your Amazon Kindle Paperwhite Battery - YouTube
Batterie de remplacement de téléphone ST22 pour Amazon Kindle Paperwhite 4, 000246 mAh, outils neufs, 58-000271, 58-1500 - AliExpress