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If you get a charger with less wattage than your laptop’s rated power input, it’ll simply charge slowly. Secondly, USB-C Power Delivery (PD) is an intelligent protocol. Look out for the supported power rating of the cable. But not all USB-C to USB-C cables are created equal.

Other additional factors to note before buying a USB-C laptop charger: one, most chargers don’t ship with a compatible USB-C to USB-C cable.

Microsoft Surface Book 2 13/15-inch: 65W.

MacBook Pro 13-inch (2016 onwards): 61W USB-C adapter.

MacBook Air (2018 onwards): 30W USB-C adapter.

MacBook (2015 onwards): 30W USB-C adapter.

If your laptop is not listed below, you can confirm the wattage from the BIOS setup by pressing F2 during startup. Below are some of the power requirements for laptops that support USB-C charging. Aim for something above 30W because that’s the minimum power input most laptops that support USB-Charging support. You’ll find those that support 15W, 18W, 25W, 32W. However, not all USB-C car chargers are created equal.

USB-C supplies more power than USB-C and is what you’ll need to charge your laptop.

But most cars have a cigarette lighter port that can be used to charge your smartphone or laptop using either a standard USB-A or USB-C charger. Modern cars now include USB charging ports. Otherwise, using a charger that’s below the rated power either will charge your laptop super slowly or won’t work rightly. Most laptops will support 30W charger as the bare minimum. Before we get any further, confirm the power rating of your laptop.