I doubt it, as I n++ your n=1 by experience, but also since I think it shouldn't be hard, electronics wise, to stop charging once full (or even, optionally, 80%

I doubt it, as I n++ your n=1 by experience, but also since I think it shouldn't be hard, electronics wise, to stop charging once full (or even, optionally, 80% / 90%) and fully run on AC as long as it's available. Also I'd say this is an apparent user requirement for laptops.