Hi, i have a 2010 15" base model Macbook Pro and it has been 3 weeks since i bought it. And i haven't used it for 10 days because i was traveling and it wasn't with me. So i just used it for like 10-12 days. I calibrated it once i bought it. Coconut battery shows only 92% health , 10 cycles and 2 months of age. for example it is full brightness right now, no keyboard backlight, no flash, just safari running, bluetooth off it is 88% and shows 5 hours remaining. No where near 8-10 hours. I have seen it go 6-7 hours the most when the brightness was low. Also it's health was 100% after calibration and it was 97-99% before i left for travel. I came ack today, launched it after 9-10 days and 92% battery capacity.