If the MagSafe puck and the AC adapter can't negotiate the 9V and 2.22 amps, USB Power Delivery will default to the highest common mutually compatible voltage and amperage that it can, not to exceed ...
In case you’re interested in a cheap, reusable 9V to USB adapter/charger, AnythingButiPod has a neat step-by-step tutorial up that requires little more than soldering. Or you can always just buy a ...
While the world is moving towards USB-C, plenty of other ports are still in use. Here are USB adapters that ensure you never run into compatibility issues.
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