MacBook Air Mid 2013 - 13 inch keeps turning off
Hi, so I bought a secondhand MacBook air and I haven't used it for almost 6 months since I haven't bought a charger since the lockdown started. So just this week, I was able to bought a new one and when I opened my MacBook air, it keeps on turning off after the fan turns extremely fast and loud but other times, it just suddenly shuts down w/o even opening heavy apps. I've already tried all of the possible solutions like resetting SMC, PRAM, the hardware test, etc.. but still no improvement.
When I checked the previous shutdown causes, most of the time I get -82 and I couldn't find any explanations about it. Can someone enlighten me what this means? Is it a serious problem? Please help.
MacBook Air 13″, macOS 11.2