I had a Lenovo p15 running fedora for a while and got 6 to 8 hours battery life whilst working which was approx. the same as the original OEM windows install. S

I had a Lenovo p15 running fedora for a while and got 6 to 8 hours battery life whilst working which was approx. the same as the original OEM windows install. So it might be a case by case situation.