It is not possible to say without the device on-hand.
Perhaps not even then.
For certain, do:
Open device (same directions as a PW1 - see our teardown links).
Disconnect the battery (you don't want to deep discharge the battery).
Disconnecting the battery is the only way to "turn off" a Kindle.
Continue to keep packed in well dried rice.
Try it (after re-charging) once a month.
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