MBP late 2011, 15" I have had it over 6months and have got great battery from it after full charge. The original charger broke 1month ago. Laptop and charger was bought in New York. The replacement charger was bought in Ireland, Magsafe 85w. I have charged it to 100%, let it go down to 0, and rest 5hrs, and recharged it back to 100%. Now on full 100% not plugged in it says I only get 2hrs 15minutes from it, and the percentage s dropping alot faster than it ever did. cycles 377 health 96 % Is there any reason how this battery life has become so poor so suddenly? And when do you replace a battery or any other tips?