I hope your MBP is not warning you about the end of your life ;) My thinking about what your Mac is doing is in line with rsynnott, it might be based on your b

I hope your MBP is not warning you about the end of your life ;) My thinking about what your Mac is doing is in line with rsynnott, it might be based on your battery's current charge capacity vs. its original capacity, I'm more inclined to think the message is triggered by your battery's cycle count. You can find all this information in the System Information application, under Power.