Certified MagSafe chargers also have a single-wire NFC antenna that allows the iPhone to identify the device, a built-in magnetometer, and a compass to prevent interference while you are using your iPhone while it’s charging. This ensures that the output charging is 15W, compared to non-certified but MagSafe-compatible Qi chargers that are usually just 7.5W. With MagSafe’s optimum positioning, that wireless inefficiency is more like 30% wastage compared to cabled charging via Lightning.Īnd you’re less likely to wake up to find your phone wasn’t correctly placed so didn’t charge at all! MagSafe certificationĪpple certifies MagSafe accessories with its Made for iPhone (MFI) badge. Wireless charging is inefficient, losing as much as 50% of its power through poor placement and a handful of environmental factors. Second, the connection is much more precise than what you get from just placing your phone on top of a non-magnetic wireless charging pad. That’s still faster than the compatible chargers but the speed benefit of certified MagSafe isn’t quite as stark as the simple numbers suggest. In our tests, MagSafe speeds slowed to under 10W once the iPhone reached 50 percent charged.
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