At the point that it reaches this genuine full mark it then runs on battery until the value is lowered back to 95% physical/100% logical. Physically as the battery reaches 100% charge, logically that is essentially going over the 100% level shown to the user, say to 105% (although this isn't shown, clearly). If you leave it plugged in however, it continues to charge. At this point you can safely unplug and use the device (there is no need to charge a modern battery all the way to prevent memory damage) although it might not be fully charged regardless of what it says. The battery will show as full when in reality it's only, for example, say 95% full (I don't know the exacts, which probably changes model to model anyway). The genuine 100% charge state is still monitored in the same way, but the way it is reported to the user is different. So in iOS, they switched to a different method of reporting battery life. This causes (or used to cause) endless user confusion Why doesn't my battery get to 100%?!?! My battery is faulty. It will wait until a lower indication is reached, say 94%, and then when it drops below this threshold start to charge again. As such, if you unplug to walk to another room and drop from 100% to 98%, it will determine that it's not worth the potential shortening of a batteries long term life just to give you a 2% recharge. 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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