Here’s why the USB port built into your car charges so agonizingly slow

usb
September 4, 2017 | by: Bill Bradley

 

“The USB ports in your car seem like a convenient feature, but often don’t provide enough power to charge your device while using it. Instead, they often only slow the speed at which your battery drains — your phone will use power faster than the car USB port can supply it,” the company wrote in a recent blog post. Car manufacturers are beginning to install higher powered USB ports inside vehicles, Ventev added, but the instances are fairly rare. “The only exception we know of is one Acura model that advertises 2.4 amps in its USB ports, which would charge your phone just fine.”
A phone plugged into a USB port in a car — USB Car Charger Hardly Works

How-to Geek confirmed that finding: “We measured multiple vehicles with a USB voltage/amperage meter and found that the data port in the dash (commonly used to hook up a USB drive or phone to play music) offered a very weak 0.5A output. While that’s enough to power your USB drive full of MP3s, it’s barely enough to trickle charge an iPhone and maintain the current battery level—if you’re using the phone for navigation, a notorious battery hog, it’s unlikely you’ll even charge it faster than it drains.”

Jeremy Kaplan
Digital TrendsSeptember 2, 2017

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