When the notebook is newly used, the battery is charged and discharged!

It doesn't matter, the two methods have little difference in the function of the battery.

Although dead power is good for the battery, it is not good for the hard disk.

So it doesn't matter.

Also, 12 hours without charging. The current batteries are all protected and will not automatically charge when they are full. Just make it up every time, there is no need 12 hours.

The saying "three times in a row, 12 hours" is old and unreliable. Before 2056, that's more like it.