I made a thread a few days ago about how I bought a used laptop and it would turn on with the charger alone (no battery), but after I inserted the battery and booted it, it installed a Windows update (very likely the cause of this mishap), and would boot up normally (but wouldn't charge), but as it had 8% battery, eventually it died and it doesn't charge at all, regardless if the battery is inside or not. I contacted the previous owner, and he's playing stupid saying he mentioned in the article that the battery was defect and that it would work only with the charger. I sent him a screenshot of the article, where he says everything is just nice and dandy with the laptop, no word mentioning the "all of a sudden" defect battery. I don't know how that will play out, will buying a new battery fix the issue? Did the Windows update actually break the charging? The laptop's a Sony Vaio VPCCB2S1E. As for why am I buying a used laptop in the first place? I'm a student that's eating pasta every day, enough said.
Oh, and if I do insert the battery and try to boot the laptop, it actually does start booting until it shuts down because there's no power.