This can happen because of two reasons: Batteries do discharge themselves slowly over time because of the cell chemistry, even if there is nothing they are powering. Instead, it waits until your battery drops a few percentage points by itself. Sailing mode does not actively discharge (eg unplug) your MacBook. Maybe as the battery gets older, I'll start to see the battery percentage drop from 80% - as the older battery won't hold its charge as well any more (which was one of his two reasons for the 80% level dropping, cell chemistry). His two reasons don't apply - the newer battery in an M1 Mac isn't discharging much because of cell chemistry, and there are few if any times that the M1 Mac has to draw power from both the power adapter and the battery. On an M1 Mac, the battery (at least when it's newer) will hold that 80% charge most/all of the time (as the two reasons he gives for why the percentage would drop won't happen much on a newer M1 Mac), which is why I don't see the percentage drop from 80% to 70%. I think what he is saying is the MagSafe charger powers the Mac even when the battery is at 80%, and AlDente keeps the battery charge from going above 80%. I should have known that was wrong as the LED is "orange" which means "charging" (and connected of course). I think my misunderstanding was that I thought the battery powers the Mac once the battery is at 80% and that the power adapter does not supply power until the battery drops to 70%, at which time AlDente lets the power adapter charge until the battery is back up to 80%. I heard back, I pasted what he said below.
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