In one week my MBP 13 mid2010 battery life decreased from 93% to 82%. I used to calibrate the battery as indicated by apple. I calibrated last night and the battery life decreased from 83 to 82%. I wanted to ask if this decrease is normal or if I am having a battery problem. Apple stated that the battery should hold 80% at 1000 cycles. Now my MBP is at 82% at 60 cycles. What is getting wrong?