Energy saving mode uses more power?

For some reason my notebook only runs 2 hours in the energy saving mode and 8 hours in the normal mode. Shouldn't it be the other way around?

Should be the other way around, yes.

Actually already. But it does not only depend on the mode in which it is located, but also how and how often you use the mobile phone

Then the ESM is manually set less favorable with you than the NM. Better set up the energy saving plan, then everything will be fine again, but write down the values of your NM so that it is easier for you.