Same thing with the cable, if the device can't 'sink' more than a certain amount of current, it doesn't matter that you're using a 5A charger, the phone just won't be able to draw that much. But I also forgot to mention that your device should support fast charging.

Now, I'm not sure about the Note 3, but I think (again, not sure) it's rated at 2.5A, so a 2.4 should work as expected, but remember that the supplied charger is already 2A, so if it takes 4 hours to charge in that one, the difference won't be abysmal on a 2.4A charger.Īnd also, make sure your car's outlet can stand it! 2.4A is A LOT to draw from a car and some models won't stand that much current draw (some even have two outlets one for high-power consumption like DC/AC converters and laptop adapters and one for low-power stuff like the cigarette lighter and such). So, if I get a legit cable that supports the amps, and I'm using a USB connector, it sounds like that's the way to go for a 2 hour charge, not a 4 hour charge!!! I have a 2.4 Amp dual usb port charger in the car, and I'd be buying a 2.4amp (dual usb) charger for home.

Charge time between usb 2 vs usb 3