A surface book 2 that is terribly slow - is it due to the missing battery?

So I have a Microsoft Surface Book 2 which still today has reasonable specs (8th gen i7 CPU, Nvidea GTX 1050 graphics card, and 16 GB memory), although it is above 3 years old. Unfortunately it got the swollen battery issue which is common for these devices, so when the screen started to come unglued from the frame because of a bulging battery, I shut it down permanently, and purchased a Dell XPS 17 instead for my main laptop workstation, and since then I have left the Surface alone for a few months. Now this week I got scared of the fire-hazard of the battery, and at the same time got curious

Question by Andras on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.