Why is it bad for the battery of a laptop if it hangs permanently on the power supply?

Af
4

It is well known that it is bad for a battery, if it is permanently connected to the power supply, I would be interested in why?

vi

I have recently answered

Sh

The permanently hanging on the net does not matter to the battery.

What annoys and shortens its life is the heat to which it is unnecessarily exposed.

And thank you - also a nice holiday.

Na
lo

The problem is the so-called microcycles.

such a laptop has the uncomfortable habit of using more or less electricity depending on the load.

that's not bad at first, but even something very good. So the battery lasts longer. The problem is, as soon as the device is plugged in, it fluctuates between drawing power from the battery and recharging the battery. And this back and forth between loading and unloading, that does not like a battery. Neither the lead battery in the car, nor the lithium ion battery in the laptop…