This is something that takes people by surprise: All batteries will stop working. Once it gets to above 95%, the battery is stopped charging and the power consumption is reduced to only powering the Mac, keeping the battery at a constant level. If we were charging a MacBook Air, it’s power consumption would drop from 45w to 10w and below. The 45w power adapter is much smaller than the 60w or the 85w and is cheaper to manufacture.īattery charge graph details how your battery charges over time (graph courtesy of Apple)Īfter that, the Mac will reduce it’s power consumption more and more until it develops a trickle charge. So why does Apple ship different power adapters with their Macs? Simple: size and cost. You can’t overpower a battery from a power adapter as the battery draws power from the adapter, it doesn’t push the power onto the battery. Now, if we use the 85w power adapter, we can charge all three portable Macs. It probably won’t charge the MacBook Pro 15” or just about power it. ![]() It will charge the MacBook Pro 13” as well but it will be much slower to do so. The 45w power adapter will charge the MacBook Air with no problems. Each power adapter provides a certain amount of power. But the large tap is just a tap - we can still fill the small bucket with it, it just doesn’t need to be turned on all the way. That’s better, we can now fill the large bucket. At this rate, we’d never get it full! So, we need a bigger tap. Now, if we tried to fill the large bucket with the small tap, the water is just rushing out almost as fast as we can fill it. Filling the small bucket is easy, we can fill it faster than the water runs out. Now, we can fill each bucket with water from a small tap. This means the small bucket has a small hole, the large bucket has a larger hole. Imagine you have two buckets of varying size (small and large) and each bucket has a hole that’s proportional to its size. What you might not realize is that the above power adapters will work with each Mac, but depending on the combination, they might not work as well. ![]() Each power adapter has a power rating in watts. The bigger the battery, the more power it needs to charge. So, what’s the difference? The larger the portable, the bigger the battery. Apple’s power adapters currently all use the newer MagSafe 2 connector
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