My macbook kept on flickering between 99% to 100% full charge. The light on the charger would also kept on changing from orange to green back and forth.
I noticed that it just started happening recently. Anyone know what the problem is?
Also... how do you know he's using a Macbook Pro charger?
I'd drain the battery down until it gives you the warning that you're at reserve, then I'd turn it off, take the battery out and hold the power button for 5 seconds to reset the smc. Then put the battery back in, charge it up, and see what happens.