Down voters please explain. He not reply so far is a link that substantiates the above advice. An Apple.com recommends a occasional full discharge, mainly to calibrate the percentage estimator.
There was a link making the rounds late last week about the "best" amperage to charge lithium ion batteries. Someone made the false remark that using a computers USB port to "slow charge" is better because it means you're staying under this value. However, that's not what the article said nor are wall changers actually above the stated value.
The better takeaway from the article is to keep Li batteries cooler than ~95F to extended their life.
There is also no need to condition Li batteries. Apple used to have you do a calibration step for new batteries, but that was to reset the circuitry that was used to estimate the charge left in a battery. The old replaceable batteries had this built into the battery (the little button you pushed to get the row of green lights.) In new MacBooks this is all factory calibrated.
The better takeaway from the article is to keep Li batteries cooler than ~95F to extended their life.
There is also no need to condition Li batteries. Apple used to have you do a calibration step for new batteries, but that was to reset the circuitry that was used to estimate the charge left in a battery. The old replaceable batteries had this built into the battery (the little button you pushed to get the row of green lights.) In new MacBooks this is all factory calibrated.