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My laptop has done that since it was new. Some days it says 99, some 98, etc. Never lower than ~96 (unless of course I actually use the battery), and I have no reason to believe there's anything wrong with the battery.
My guess is that the system has a distinct charging mode, that it only enters when the battery capacity is below a certain level. It charges it up, then shuts off charging, and lets the battery sit and float. Over time the battery will self-discharge, causing the capacity to drop a couple of percent, and when it hits the charging threshold it gives it a little blast of current to bring it back up to full before letting it float again.
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decreasing power indication
