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A high quality LiPO battery designed for C/10 or lower loads can have a self-discharge rate as low as 1%/month. Start at 55% charge and that gives you over two years in a cool climate controlled warehouse to 30%. After that, its time to hold a special sale to shift the overstock.
OTOH if a private seller has kept it unopened in a warm place and the initial charge was on the low side, it could well be dead.
I wonder how many of Amazon's refurb kindles are simply ones that have been sitting around too long and had a battery replacement.
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