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Lithium battery life is affected by time and temperature as well as number of cycles. A cycle is a bit complicated.
No such thing as a working NOS lithium battery if over 2 to 5 years old. The battery in your ereader could be almost 10 years old.
Also there are other reasons to avoid old Kindles, though the Kindle Keyboard is better than the DX or later DXG, as the DXG uses older Firmware than older Keyboard models (DXG B009 vs Keyboard B008).
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