If none of these little explanations seems to address the circumstances at hand or the behavior you've observed, you can always take your machine and adapter to a Genius Bar and have them tested without charge. The charging current tapers off sharply as full charge approaches. When the connection is secure, an LED located at the head of the DC connector lights up an amber light. Its held in place magnetically, so if someone should trip over it, the cord disconnects harmlessly and your notebook stays put safely. when the battery is deeply drained, than it does later, when the battery is closer to fully charged. The Apple 60W MagSafe Power Adapter is made specifically for your MacBook or MacBook Pro 13-inch model. It's also true that the charging process itself draws more power and generates more heat early in a charge, i.e. When charging the battery is all that's happening, the adapter doesn't need to supply nearly as much power, and runs considerably cooler. The charger will also get hotter when the machine is in use than when it isn't, all other things being equal, because more power is being drawn from the adapter to power whatever you're doing. Rest it on a hard flat surface, just like the MBP itself. If your adapter "brick" is resting on a soft surface like upholstery, bedclothes or a carpet, it will heat up more than normally because air can't circulate freely around it.
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