My laptop loses about 85% in 30min that is very much I know but what is better for him if I charge it and empty it then recharge it or keep it charging all the time
It is best, of course, to always connect to electricity
RWTH Aachen tested the time. After that, it is best if the battery is always between 70 and 30% charged, i.e. Neither completely full nor completely empty. So the battery has the longest service life!
It is always best for a battery to be held between 15 and 95% charge. Yours is actually already over, so it doesn't matter.
In theory, of course, that's wrong, but hardly anyone cares about company devices. Because of this, the batteries are usually pretty battered even after 6 months. You put it in the docking station or hang it on the charger without thinking further. And of course I do that too.
Since the battery is already electronic waste, you can charge it as you want. It doesn't matter whether you still do something with rhythm etc.