I cycle the battery once a month i.e. completely run out the battery and leave it discharged for 8 hrs. Then recharge and leave it plugged in for 8 hrs after it reaches 100%.
That isn't the procedure for calibration and all you're doing is shortening the life of your battery by fully draining it.
After calibrating it and resetting my SMC, the health is up to 79%.
The built-in batteries in the newer Mac unibody notebooks come pre-calibrated and
do not require regular calibration like the removable batteries in older Apple notebooks. Completely draining your battery is bad for it and should be avoided.
Run on battery whenever you need to and plug it in whenever you can. You can plug or unplug any time you need to, regardless of the charged percentage, and you never need to completely drain your battery.
The link below should answer most, if not all, of your battery/charging questions, including tips for maximizing battery performance. If you havent already done so, I highly recommend you take the time to read it.