Car charging vs USB car charging

[jlh73]

I use a standard at&t car charger for my s3. I wanting to know if using my cars USB to charge the s3 will have and good or bad benefits? My wife needs a car charger and I have a USB in my car and instead of buying a new charger is there any difference when charging by the cars USB?

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[bassmig]

this will really depend on the output of your car's USB. Most car chargers output anywhere from 500mA to 1000mA so depending on your car's USB output it may be able to charge your phone quicker or slower. The higher the mA output the quicker it can charge your phone, now this being said the quicker flow of power the warmer the phone/battery can get. It should not get high enough top cause damage but charging your phone in direct sunlight can make it get to unusually high levels.

 

[jlh73]

No. I would just charge it driving home from work. Just really wanted to know if it was the same as charging from a normal car charger.

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[JD Racer Dad]

Do not buy a USB Charge Only charger that uses the iPhone protocol, house or car.
The ratings as referenced above are useless unless you know first whether it uses he iPhone protocol or the non-iPhone protocol form 2007 and 2009.

iPhone as you might imagine does not follow the world standard and there is "No" Generic fix.
USB cables have four wires, two are data. The non-iPhone standard shorts them in the adapter.

Here are two that don't work (read the reviews in Amazon for disappointed customers):
1.) Mediabridge High Output Dual USB Car Charger (3.1 Amp) (this one has a 2.1 and a 1.0 Amp output rating)
2.) Griffin Powerjolt Dual Universal USB Micro (this one rated at 1.0 Amp output).
There are many name branded generics that don't work. If they say they work for an iPhone or iPod they will not put out the 1.0 Amp you will want. It's not price. They are all about the same.
Your device will discharge while you use it even though it may say Charging AC.

This one works (there are many check the reviews):
GTMax Metalic 2-Port USB Car Charger Adapter (it has a 2.1 Amp side using the iPhone protocol and a 1.0 Amp side using the non-iPhone protocol).

I have a handful of both. The 1.0 Amp side of the one above kept my phone charged for a 7 1/2 hour trip in full use, GPS, Radio App, Screen on, and Bluetooth phone.

I have tried the others and they discharged while in use.

This is not the same protocol used on the USB data port on your PC. Data ports limit the output to protect the PC. And they expect to use the two data wires as well.

this will really depend on the output of your car's USB. Most car chargers output anywhere from 500mA to 1000mA so depending on your car's USB output it may be able to charge your phone quicker or slower. The higher the mA output the quicker it can charge your phone, now this being said the quicker flow of power the warmer the phone/battery can get. It should not get high enough top cause damage but charging your phone in direct sunlight can make it get to unusually high levels.

Oh and if you are so inclined the web is full of do it yourself sites that show how to solder the circuit board in the charger to make it work. But not exactly what you might be looking for .