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Sorry if this sort of post isn't allowed, mods.
It would appear that if you're slamming the CPU and GPU with 100% load while having the screen brightness at 100%, the system pulls more power than the charger is able to supply, and it'll pull from battery, and eventually die. I believe I also experienced this once or twice while in college with my 2010 top spec MBP, but I don't have any documentation, nor have I done it with any rigid test.