Charges MacBook VERY Slowly

Since I only bought this to charge my MacBook I was very disappointed that it takes like an hour to charge it to 15%. At first I thought it wasn't charging at all. My regular USB-C cable from Apple charges very rapidly by comparison. I'm using the Apple iPad plug as the DC converter so I would think this would be similar to the USB-C DC converter plug that came with the MacBook. Maybe that's the issue. Either way it's really not a good solution.

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