Battery life whilst running FM21

Hi everyone, what are your experiences of running FM21 on a laptop in regards to the battery life of the machine? How long do you manage to play for before having to re-charge?

My Dell laptop (which is mid range and only a year old), doesn’t do brilliantly with FM21. I play the 3D games and all the graphical and other stuff going on certainly drains the battery. I usually play it plugged into the mains but if I don’t, I probably am only getting 2 hours out of my laptop. Naturally you can turn down the brightnes, lessen the leagues and not play 3D games to increase that but that will only improve things a bit.