If you run the laptop hard and it shuts off, it's most likely a heat issue, lots of laptops will simply shut off if they get too hot.
HOWEVER, it may lead back to the battery. IF you're putting a full load on the system, it needs to draw from the power supply more. If you have a power supply issue/battery issue/charging issue...the power your laptop needs might not be available quickly enough...and it simply shuts off. Kind of like short circuiting.
Run the laptop from the wall and play a game or something intense. If it runs fine, I would rule out the actual power supply in the laptop. There isn't much you can do to a battery if you don't have calibartion options (My Compaq doesn't as far as I know). So you might just need to buy a new one?
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