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The iPhone X supports fast charging. According to Apple's official specs, it only takes 30 minutes to charge its battery up to 50%. Pretty neat, huh?

But there's a problem, as noticed by Cnet: When you buy an iPhone X — or iPhone 8 and iPhone 8 Plus, which support the same feature — you don't get fast charging out of the box.

SEE ALSO:Why Apple is risking everything with the iPhone X

The fine print regarding fast charging on Apple's tech specs page for the iPhone X, 8 and 8 Plus, says the following: "Testing conducted by Apple in August 2017 using preproduction iPhone 8 and iPhone 8 Plus units and software and accessory Apple USB-C Power Adapters (29W Model A1540, 61W Model A1718, 87W Model A1719)."

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But the iPhone X, 8 and 8 Plus don't come with USB-C Power Adapters. They come, according to Apple's tech specs, with a "USB Power Adapter" which likely means USB-A. So users will have to buy a separate adapter, and the cheapest USB-C Power Adapter Apple is selling — the 29W model — costs $49 in Apple Store.

Worse, you'll need a new cable, too. The new iPhones come with a "Lightning to USB Cable" adapter, but you'll need Apple's "USB-C to Lightning Cable" adapter, which starts from $25 in the Apple Store.

You can probably get a better deal with third-party accessories, but even then, the fact that an important new feature on the new iPhones doesn't work out of the box (without a separate purchase) is tough to swallow.

We've asked Apple for comment and will update the story when we hear from them.

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