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. :
Battery for Amazon Kindle 3,Kindle 3 Wi-fi,Kindle 3G,Kindle Graphite,Kindle III | eBay
Original Replacement Battery 1530mah S11s01b For Amazon Kindle 2 & Kindle Dx Dxg D00511 D00701 D00801 Batteries - Mobile Phone Batteries - AliExpress
Amazon kindle Battery Low Problem (exclamation mark on battery) - YouTube
For Amazon Kindle Fire HD X43Z60 Wi-Fi 7in REPLACEMENT BATTERY 26S1001 58-000035 703746963447 | eBay
Kindle Fire Battery Replacement - iFixit Repair Guide
Low Battery but Kindle was charged 2 weeks ago. It's charging now but it seems like it was drained. : r/kindle
Kindle Fire HD 6 Battery Replacement - iFixit Repair Guide