Do Have to charge my iPhone 13 ProMax with a USB-C cable?
Can I charge my iPhone 13 ProMax with a USB cable or do I have to use the USB-C cable that came with it?
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You can use a USB to Lightning cable. See the following from Buy iPhone 13 Pro and iPhone 13 Pro Max - Apple
As part of our efforts to reach our environmental goals, iPhone 13 Pro and iPhone 13 Pro Max do not include a power adapter or EarPods. Included in the box is a USB‑C to Lightning Cable that supports fast charging and is compatible with USB‑C power adapters and computer ports.
We encourage you to re‑use your current power adapters and headphones that are compatible with these iPhone models. But if you need any new Apple power adapters or headphones, they are available for purchase.
Note that a USB-C cable and an 18 watt or larger power adapter are required for fast charge. See: Fast charge your iPhone - Apple Support