![]() OSX won't bother charging a battery that was at 100% until it has dropped sufficiently to make charging it back up worth it without causing potential battery health issues. On a Macbook, the behaviour shown by answer is because of this method of charging because it's not good to keep topping up the battery to absolutely full when it has only lost a percent or so - it's better to use a bit more before starting to charge again. This is a physical measure, rather than a logical one, and relies on taking voltage/ampage readings and whether they have stopped increasing or reached expected levels, etc. The normal method is to show 100% full when the battery stops charging. But before I mention that, it's worth showing how a lot of other manufacturers do it (and indeed how Apple does it on OSX hardware still). ![]() In an attempt to improve the situation, Apple did something a little different with how the battery indicator value is commonly generated in iOS. ![]() It's very common to note unusual behaviour such as you describe, and other similar behaviour like the first 50% being used slower than the last 50%, etc. ![]() That's why it's known as the indicator rather than the gauge, as the latter implies accuracy (same goes for car fuel tanks, which is why when there is less than approximately 30 miles of fuel left, my car then stops telling me the level and just says "Refuel!!"). Battery level indications are notoriously unreliable in most devices.
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