My MBP is only 2 days old. I noticed right away using iStat that the battery health was 94%. I found that a little odd for a brand new battery. I thought calibrating would probably fix this. I completely drained the battery until it went to sleep. I then charged to the full 100% and left the A/C adapter plugged in, as per the calibration steps on the Apple website. I then noticed that the battery health is now 93%. The charge cycle count is 4. Do I have a defective battery that needs to be replaced? Shouldn't the health be 100% or very close to it?