Is not it good for the battery when I have the laptop all the time on the charging cable even when it is off? So the battery gets corrupted over time or not? (Is an omen laptop)
When the battery is fully charged, the charging electronics integrated in the notebook stop charging the battery and disconnect the battery from the parallel connected mains supply.
In the long run it harms your Leptop already since he is always charged. So I would not keep it on the charger all the time.
One can't say so flat rate, as it is often (and already some years), depending on the laptop model and quality intelligent charge controls to the effect that the battery with permanent network operation in the background only when needed from a certain threshold value of self-discharge.
In the simplest case, the CCCV charging method will be used for Li-ion batteries. In this case, the battery is offered at 100% charge only a constant voltage, but then no significant flow more, but only the vanishingly low self-discharge factor is compensated.
