I'm so happy with this post. I needed to buy a cheap laptop for a family member and I went so all in on Mac a decade ago that I really don't know the lay of the land when it comes to Windows. I'll just get a Lenovo Thinkpad second hand :)
It has 2 internal batteries, and with older batteries, they can fail to switch from one to the other when they reach 0%. Models with a removable battery are a bit bulkier, but I think of greater value.