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Hmm on my sony reader memory card or no memory card has ZERO noticeable effect on battery life. My DX has very lackluster battery life. I am very unimpressed. I have to charge it twice a week usually (wireles OFF) once every other day wireless on. I am only getting maybe 3-5 novels out of a charge. my sony reader got at lease a dozen novels out of a charge.
is the kindle one always polling the memory card or something? the idea that a memory card would take more battery life is counter intuitive since there is no difference between the power needed to access internal memory and the power needed to access an SD card which for the most part uses the same chips and what not as the internal memory. Something's hinky in the design of the device is the usage of an SD card consumes more than negligible battery life.
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