From what percentage approx. Should you charge your laptop? And is it okay if you charge it overnight and use the device while charging?
Just charge overnight, that cable is just annoying
What does cell phone & smartphone have to do with it?
there are no charges
They are also charged and use the same accumulator technology
I load everything that is not currently in use.
For years without harm.
Keeping the battery between 20-80% would be perfect. From time to time this can of course be charged up to 95% for a longer period without electricity.
Laptop batteries have no problem if you charge them longer than necessary.
When the battery is full, it no longer sucks electricity.
If the battery is empty again, problems can arise.
So it is recommended to always charge the laptop before it reaches 0%.
It doesn't matter whether that's 10, 20, 90 or 99%.