By Jason Fitzpatrick, HowToGeek.com, June 8, 2017
If you have a relatively new car, it probably has a USB port in the dashboard, glove box, or center console.
So naturally, you should just use them to charge your devices, right? Not so fast: if you want speedy charging, those built-in ports just don’t cut it.
Unfortunately, the built-in ports in your car are pretty anemic when it comes to amperage. As we discussed in detail in our guide to choosing a USB charging station for your home, amperage is king. The lower the amperage, the longer it takes to charge a device (and the more difficult it is to maintain a charge if the device is in use). The higher the amperage, the faster you can charge your device (and keep it topped off while using it).