I think when I bought it originally, I took the Kindle out of the packaging, tried it for a few minutes, and then never used it again. I kept it in the original box ever since.
Li-Polymer Battery for Amazon Kindle 7th Generation Kindle 8 Kindle 8th Generati
High Quality Battery for Amazon Kindle 7th Generation 58-000083 MC-265360-03 UK
Amazon Kindle 7th Generation LCD/Body/Battery For (WP63W)(6")(9794)
Amazon Kindle 7th Generation LCD/Body For (P8ATZ)(7")(4132/14)
Amazon Kindle 7th Generation LCD/Body For (P8ATZ)(7")(9838)
Amazon Kindle 7th Generation LCD/Body For (P8ATZ)(7")(9578)