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Nicad batteries loose their charge pretty rapidly outside the machine if not in use. Li-On's are MUCH better in this respect, I see them still at 95% after two weeks, have not tried longer. Li-On's can be left in without much worry, but I can't believe the 90-100% cycling is good for Ni-Cad's. It is a pity there is no setting in the power saving stuff which says forget about the battery and leave it alone.