Magnetic USB-C cables snap on easily, but metal bits can collect on the contacts. How-To Geek says the risk to a costly phone is worth weighing.
Magnetic charging cables for phones are getting attention, and a writer at How-To Geek says to think twice before buying one. The worry is simple. A magnet attracts tiny bits of metal, and metal can carry electricity. If enough builds up on the contacts, it could cause a short circuit and damage a phone.
A magnetic cable leaves a small USB-C plug sitting in your phone's charging port. The cable itself attaches to that plug with a magnet, so it snaps on and pulls off easily. These cables can still charge fast, and one cable can have several magnetic tips for different devices.
This is not the same as Apple's MagSafe. MagSafe is built into the device as part of its design. These cables are add-ons made by other companies, without the device maker's endorsement.
The magnet in the connector picks up iron-based material, which usually conducts electricity. As that debris collects, it can bridge contacts that should stay apart. That is a short circuit, and it can cause electrical damage.
The article cites Texas Instruments to show how much is at stake. USB-C packs many pins into a tight space. A pinch or other damage can create a short between the wires that carry power and the ones that carry data. Up to 100 watts can flow through those wires, enough to fry sensitive circuits. That example covers ordinary USB-C failures, not magnetic cables specifically.
The article is clear that no data shows this happening to any serious degree. At worst, debris will probably just interrupt charging. Name-brand magnetic cable makers also list short-circuit protection and other safety measures. The concern is mostly about cables that say nothing on the subject.
Cheap cables are a separate, older problem. The writer points out that cables that skip certification and safety standards have long been risky, and that is why Apple required its MFi program for Lightning cables. Plugging a very cheap cable into a phone worth hundreds or thousands of dollars is a poor bet.
The steps in the alert box above cover the basics: look for stated short-circuit protection and proof of testing, avoid bargain cables, and keep the plug and port clean. The writer's own choice is to skip aftermarket magnetic cables for phones altogether. The benefit is small, since a phone usually survives a fall better than a laptop and fast charging keeps it plugged in only briefly.
Watch for charging that keeps cutting in and out. The article suggests that is the likeliest sign of debris. If you see metal dust on the plug or in the port, clean it before charging again.
Before buying a magnetic USB-C cable for a phone, look for listed short-circuit protection and proof of safety testing, and skip the very cheap ones.
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