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I recently pulled a kindle 4 NT out of a drawer. I hadn't used it since last summer at the beach (wrapped in a quart freezer bag for water proofing). It was totally dead, charged fine and works fine with no apparent drop in battery capacity. Li ion batteries are pretty robust. I have alot of them in the garage with power tools. Edger, weed wacker, blower. They don't get used all winter. They are ready to go after charging in the spring.
But I'd excercise caution and try to keep some charge in them. with Li batteries copper can shunt from inside the cell and short the battery when fully discharged.
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