Myountek — USB-C Cables and Charging Power | myountek.com
Five ordered steps that end with a cable rated for the current your charger actually outputs.
Step one: read the device wattage. The figure is printed in the device manual or on its own label, and it sets the ceiling for everything downstream.
Step two: read the charger output label in volts and amps. The label must show both figures; a watt number alone cannot be checked against the Power Delivery contract the port negotiates.
Step three: multiply volts by amps to get the charger's wattage. A charger labelled 20 V at 3.25 A outputs 65 W; one labelled 48 V at 5 A outputs 240 W under the Extended Power Range.
On narrow screens, swipe or scroll the plate sideways.
Step four: choose a cable rated for that current. A 5 A figure requires a cable rated for 5 A; a 3 A figure can use the minimal combination if the data rate also stays at USB 2.0.
Step five: check for an E-Marker above 3 A. All USB Type-C cables except the minimal USB 2.0 and 3 A combination must contain the chip, and the charger reads it before raising current.
Common failure points: a charger that never leaves the 5 V default mode, a cable capped at 3 A because it lacks an E-Marker, and a device needing more than 100 W paired with a standard-range charger that cannot reach 240 W.
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