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Some Apple notebooks also claim to have 10-year batteries, but you pay a premium price for those...
Lithium batteries do NOT like to be overly discharged. Nor should they be stored with a full charge. For storage or safe transport, 40 to 50% charge is good (but no more than 70%).
In fact, for mission-critical batteries (such as used in military/police/fire/medical equipment), they are never charged past 70% of an otherwise identical "consumer device" battery, for maximum lifespan.
The kindles even have a "shipping mode" script, that DISCHARGES the battery to below 70% (which can also be done in the kindle diagnostic menus).
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