Best answer: USB Power Delivery, or USB-PD, is a protocol specification that supports power delivery up to 100W while using a single cable. It allows a range of devices, including Apple's Smart Battery Case for iPhone XS, iPhone XS Max, and iPhone XR, to charge faster.

What is USB-PD?

Offering up to 100W of power makes USB-PD the fastest USB power delivery system to date. USB-PD can charge your device up to 70 percent faster than standard 5W charging. You need a USB-PD compatible charger, however, to make this possible.

Case compatibility

The Smart Battery Case, which uses Apple Lightning like the phone itself, is compatible with Qi-certified chargers. When the case is on, you'll see the intelligent battery status display on the iPhone Lock Screen and in Notification Center. Each case features a soft microfiber lining for iPhone protection. The silicone exterior offers a silky, soft-touch finish, while the soft elastomer hinge design makes it simple to pull the case on and off.

Besides USB-PD compatible chargers, the cases support Lightning accessories, such as the EarPods with Lightning Connector or the Lightning Digital AV Adapter.

More information on charging

Whether your iPhone or Smart Battery Case charges first depends on the type of charger you're using and how much power is being taken in. For example, a MacBook Pro adapter will fast charge both devices at the same time, while using the 5-watt adapter that comes with your iPhone will charge the phone first.

When charging, you can leave the iPhone in the Smart Battery Case to charge them both at the same time or charge them separately. To do so, insert the Lightning to USB Cable that came with your iPhone into the Lightning connect on the case. From there, connect the Lightning to USB Cable to the Apple USB Power Adapter and plug the adapter into a power outlet.

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iPhone XR Smart Battery Case

Best is even better

To date, the iPhone XR has the longest lasting battery of any iPhone sold. With the iPhone XR Smart Battery Case, you can increase talk time up to 39 hours, internet use by 22 hours, and video playback up to 27 hours. Like the other cases listed, the battery case is available in black and white only.

Go for it

iPhone XS Smart Battery Case

Your phone will thank you

The iPhone XS Smart Battery Case offers increased talk time up to 33 hours, internet use up to 21 hours, and video playback up to 25 hours. It contains two cells, each with a 1,369 mAh battery inside like the ones for the other two iPhone models.

Even bigger

iPhone XS Max Smart Battery Case

It's time to stretch

Finally, there's the iPhone XS Max Smart Battery Case which promises to increase talk time up to 37 hours, internet use to 20 hours, and video playback to 25 hours. Like the Smart Battery Case for the regular iPhone XS model, this one includes a 1,369 mAh battery.

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