Don't use your car's USB ports to charge your laptop -- Do this instead - Engadget

Engadget warns that many car USB ports aren’t built to charge laptops, especially modern models that require significantly higher wattage via USB Power Delivery (USB-C PD). The article explains that dashboard and center-console ports are often intended for phones or media playback, so plugging a laptop in can result in only a slow trickle. It uses examples: a 13-inch MacBook Air needs up to 70W for fast charging, the latest 14-inch MacBook Pro needs 96W or more, and many Windows laptops fall into similar ranges. The recommended approach is to check the charger’s printed wattage and only use car ports labeled for USB-C PD or high-wattage charging.