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2

There's no way to know from a simple visual examination. You have three options... [the cavalier] Try it & see what happens [the circumspect] Take it to be tested [the disposable income] Buy a new one & throw that one away.


2

Most MacBook use MagSafe charging which doesn't operate on the same voltage as USB - so the vast majority of battery banks that charge anything USB won't work. There are some inverters that would power the adapter using 120 or 240 VAC but those are quite large. Only the new MacBook with USB-C connector is low power enough to charge over the new power ...


0

Standard USB ports can not handle the load of power that a Macbook Air/Pro draws. So no, it is not advisable even if you could find an adapter. (Note that if you have the new ultrathin Macbook—not the Air or Pro—you can use a USB-C to USB2 cable to charge it from a power bank.) You can get a special power bank (like this one) that can charge your Macbook ...


1

It's not worth the potential fire hazard. If you go to Apple.com and look at the reviews on the MacBook chargers, people are very frustrated with the need to replace the chargers so frequently due to wear exactly where you described it. I would highly recommend replacing the charger over repairing it.



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