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I am leaving for a vacation and leaving my rMBP. How should I store it except from shutting it down? How much charge should I leave in order not to lose too much capacity?

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You are overthinking this as there is nothing special about the lithium battery that requires special storage considerations. Just store it like you normally would; I put mine on a bookshelf to hide it from the inevitable human curiosity of the dog walker/plant waterer when I go on extended trips.

Your lithium ion battery is going to lose capacity whether you use it or not because the biggest factor in the longevity of a battery is age not how much it's charged. Now, the amount that it loses over the month is going to be negligible; you won't even notice.

I posted an answer that is relevant to this question: MATH FINDS TOP CULPRIT AS LITHIUM-ION BATTERIES AGE

Just leave it plugged in over the month and you will be fine.

  • Why would you leave it plugged in? Increased risk of fire, shorting of the computer from a possible power surge, and won't leaving it plugged in degrade the battery faster? Also, it'll use up more power! And, if you turn the Mac off for the month, it won't lose too much battery over the course of a month; you'll probably have it half-full when you return! What's the benefit? – owlswipe Jul 10 '16 at 2:32
  • Because when I get home, I don't want to wait to charge it. Everything you listed there can happen whether you are home or away. (Well, they can't "short" from a surge, they are overloaded); which is why I plug it into a surge suppressor. "It'll be fully charged when he gets home." Do you know that hey put it away fully charged? – Allan Jul 10 '16 at 10:49
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Doesn't matter what % charge you leave it at. You won't lose too much charging capacity any way you do it. Just be sure to fully shut it down and store it in a cool (not cold) dark place.

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To quote directly from Apple about their own products and batteries: "Store it half-charged when you store it long term. If you want to store your device long term, two key factors will affect the overall health of your battery: the environmental temperature and the percentage of charge on the battery when it’s powered down for storage. Therefore, we recommend the following:

Do not fully charge or fully discharge your device’s battery — charge it to around 50 per cent. If you store a device when its battery is fully discharged, the battery could fall into a deep discharge state, which renders it incapable of holding a charge. Conversely, if you store it fully charged for an extended period of time, the battery may lose some capacity, leading to shorter battery life. Power down the device to avoid additional battery use. Place your device in a cool, moisture-free environment that’s less than 32° C (90° F). If you plan to store your device for longer than six months, charge it to 50 per cent every six months. Depending on how long you store your device, it may be in a low-battery state when you remove it from long-term storage. After it’s removed from storage, it may require 20 minutes of charging with the original adapter before you can use it."

See: http://www.apple.com/au/batteries/maximizing-performance/ as well as https://support.apple.com/en-au/HT204054 for further information on batteries in Apple products.

  • Appreciate the reply!, So I guess 65% is ok? (I Shut it down with 65%) – Eliot_A Jul 10 '16 at 11:18
  • This is no longer applicable to modern L-ion batteries. They don't develop memory like the older ones do. – Allan Jul 10 '16 at 11:53
  • I believe Apple should know their own products best. Li-Ion Batteries do suffer from a minor issue not so much a memory effect. The 'fuel gauge' can become mis calibrated after too many random discharge and charge cycles. Case in point my iPhone 5s (which has Li-Pol) will drain down to 1% charge and stay there for about an hour before actually depleting fully. Apple has tested this device and battery health is OK. Just need to properly fully charge the device and it fixes itself. The actual charge capacity doesn't change. – David Baverstock Jul 10 '16 at 12:43

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