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CooLJoE, Because if it's 80% full you don't want to charge it. It's not good for the battery to be charged more times than necessary.
BTW, I made a dock with a power switch and a sepparatable ac-adapter, its in this (MODS) forum with some horrible pics.
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ihp-120 w/ Sony MDR-EX71. Clip reversed and custom made charging cradle.
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