HT204054: About Mac notebook batteries
Learn about About Mac notebook batteries
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Helpful answers
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Dec 8, 2014 12:28 AM in response to Al Mayberryby Esquared,★Helpful"Full discharges put a lot of strain on the battery, and it's much better practice to do shallow discharges to no lower than 20 percent."
http://arstechnica.com/gadgets/2014/04/ask-ars-the-best-way-to-use-a-lithium-ion -battery-redux/
That's about it. For the rest: https://www.apple.com/batteries/