I have a second gen MBA that's getting close to 4 years old. Earlier today I was using it, and immediately after waking it up from sleep the fans went crazy, iStat Pro told me that the temperature was 85C. After a few minutes of that the temperatures were going down, but the computer suddenly shut off and wouldn't turn back on. I took it back to where I had the power adaptor and tried turning it on with it plugged in and it worked, but said the charge was 0% while I remember looking at it shortly before it turned off and it was around 40%. Also I'd been watching the battery health on iStat pro since I know it's holding a lot less charge than it used to, and it was at 84%, but after it switched off and I turned it back on the battery health had dropped to around 50%. After using it briefly on the battery and then plugging it back in iStat Pro has said the health went back up to 84% though. Anyway, what my question is, is there something going on here besides just the fact that it's an old battery that is getting close to needing replacement?