This is for all portable mac users really. What is you battery health like? I have a 2010 macbook with the original main battery. It is 6.3 years old and health of 89% (335 cycles) I can still reliably get 4 or more hours from it depending on use. How many windows laptops still can do that if left plugged in like mine! seems apples like being used plugged in and windows machines prefer to be used on battery often. So what is everyones battery like? age/health etc? I'm genuinely curious as they seem very good, which again is what your paying for not the cheap crap in windows laptops.