I power down my Nook every night. I also need to recharge it every day or every other day, with the battery power down to anywhere from thirty to sixty percent. I'm not sure if my turning it off nightly saves much power, but I figure I have to recharge it often enough as is.
As with my Cybook, the battery doesn't last anywhere close to the touted eight thousand page turns, even in airplane mode. Extrapolating from my usual battery drain (I never use it until the battery is completely drained), I might get at most one thousand page turns on a complete charge. I'd love to have a battery that truly lasts for even half the promised amount.
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