I have a new 2021 Macbook pro -- the kind that has magsafe again as well as allowing charging via USB-C. I kind of want to optimize battery health but don't want to think about it too much. Also I almost always use it at my desk and never leave the house. Apparently you shouldn't leave a laptop plugged in at 100% battery day and night. I hear that staying between 40% and 80% battery is optimal.

So I came up with this strategy: I charge my laptop with a phone charger that charges so slowly that when I'm using it it actually loses charge. But then I dim the screen a bit so it actually redqueens. I.e., the battery level stays constant indefinitely.

I mentioned this in the Beeminder Discord and gbear605 said she suspects that that's worse than leaving it plugged in with the normal charger. Something about the USB ports drawing power from the battery.

So that's my question. Is it better to just leave it plugged in at 100% day and night rather than charge it with a very slow USB-C charger meant for a phone that keeps it from getting above 80%?

I know that I could do better than either of those strategies, like by using software that keeps it from going above 80% battery, but let's assume I'm not willing to put in that much effort.

So this resolves YES if I'm better off leaving the magsafe charger plugged in 24/7 and resolves NO if it's better in terms of battery health to use a USB-C charger that keeps it below 80%.