How to Replace Your Amazon Kindle Voyage Battery - YouTube
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 Paperwhite G090 Battery - YouTube
Amazon boosts Kindle Paperwhite screen size and battery life in first major upgrade in 3 years – GeekWire