If you want to use the Apple Watch Series 7’s new fast charging, make sure to use the cable in the box

Image: Apple

One of the best features on the is its newly added fast charging system, which Apple claims is 33 percent and capable of charging the watch to about 80 percent charge in about 45 minutes. But if you want to take advantage of the fast charging, you’ll need to make sure to use the charger that comes with the Series 7, which is a brand new “” that’s different from the old model (which doesn’t offer similar charging speeds).

The old USB-C charger and the new model look identical from the outside, but only the new cable can charge the Series 7 at full speed (assuming you’ve got a USB-C charger that can put out the proper wattage, that is — Apple recommends its own 20W USB-C charger, of...