Hi all, I own a mid-2010 15" MacBook Pro. Today I was using it with the adapter connected, battery at full charge. Out of nowhere, it shutdown instantly. I could not turn it back on, and the battery indicator leds just flashed once really short when checking the battery. Still, the magsafe indicator had its green led lighted. I disconnected all peripherals including the adapter. Still wouldn't start. I reconnected the adapter and it automatically booted. After logging in, another instant shutdown. I manually started it again. This time it kept working, just as if nothing had happened. EXCEPT, the battery was now fully discharged. My technical knowledge tells me this is impossible to happen in the blink of an eye without setting anything on fire, but hey, I could be wrong. I can't find any odd console logs or any other odd behavior, so it must be hardware related. Is the battery slowly giving up on me? iStat Pro tells me the battery is at 93% health after 308 cycles, and it has always performed perfectly well in the past. A quick search around the web didn't help me, so I'm asking for your help. Could the battery be dying any day now? Should I replace it to prevent it from damaging other internals? Could it be firmware related? Any advice is appreciated! PS: The battery did start charging again, happening as you read.