I took my Macbook in for an unrelated issue and also asked the Apple employee about my weak battery life (2.5 hours on a 2 year old battery). He hooked it up via thunderbolt to some diagnostic tool and looked at the battery section (looked like the attached drawing). Does anyone have some idea what the colors and scales are, and what the values are that separate green from red and red from yellow? I'm guessing green was normal battery, yellow was replace soon and red was service battery, horizontal scale was #cycles and vertical scale was battery health, 80% health is where green meets red and 300 or 500 cycles is where red meets yellow. I might have mixed up red and yellow in my memory. Mine fell on the black dot (which makes sense since coconutbattery and istat pro say 81% health after 270 cycles). I'm assuming they use this as a visual indicator of whether or not to replace the battery under warranty...eg. if it's green, no replacement. If it's red, replacement. But I didn't ask and this is just a guess. I know this is a somewhat frivolous thread but I was hoping he'd approve a replacement since mine is draining at 3-4x the rate Apple suggests it will (they say their batteries will retain 80% battery health after 1000 cycles) but he said no to a replacement, that my battery is normal.