iPhone Duo Charging: Apple's Support Pages Detail Adapter Requirements

Apple has published guidance on how to achieve the fastest charging speeds for its iPhone Duo, and the required hardware is specific. According to the company's support documentation, reaching 50 percent battery in about 20 minutes requires a wired connection. This setup needs the USB-C cable that comes in the box paired with a compatible power adapter.

For that wired speed, Apple lists its own 40W Dynamic Power Adapter with 60W Max, which was priced at $34 when the report was published. The company also states that third-party adapters rated for 60W or higher can be used, provided they support Adjustable Voltage Supply (AVS) and USB Power Delivery (USB-PD) 3.2. Wireless charging offers a slower but still fast path, with the iPhone Duo reaching 50 percent in about 30 minutes. This requires either a MagSafe Charger, listed at $30, or an adapter rated at 35W or higher, with Apple pointing to compatible adapters from Apple and Anker for this purpose.

The author of the 9to5Mac report notes that third-party chargers are often a better value than Apple's own power adapters. Their recommendation is Anker's 100W charging brick, which can also be used with Macs and iPads. The author adds that Apple's 40W Dynamic Power Adapter remains a good deal for those who prefer a first-party option. For users who need a longer reach than the included cable provides, the report mentions that Apple's official 2-meter USB-C cable is available at a discount.

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