10 Hrs? No it actually read 11 hours and 28 min. I had 2 hours and 30 min with 100% charge on my 4th cycle But after several Calibration now it reads 11 Hours 28 min at 100% Battery actually do last around 8 hours when used mildly with 40% screen light. With Transmission running and 80% light, 6-7 hours. Add the Video streaming and still 4-5 hours. Sorry Steve Jobs for calling you liar about 10 hour battery life. I love my MacBook Pro 13"