First GS3 Road Trip

[Igo]

What is the amp craw on a car charger? I hunted for 1A home chargers and have not been able to made power usage outrun the chargers ability to keep up. Of coarse I wasn't navigating in my living room though.

[valeres]

Valeres, I went back to my older 1.0 Android Charger and the phone stopped discharging while in use and on the charger.
There is a iPhone/Android protocol issue limiting the charge from some USB chargers...

The Scoche charger I'm using does not have the protocol problem as verified by my watt-hour meter, the phone seems to draw 890ma no matter what source it is plugged into

What is the amp draw on a car charger? I hunted for 1A home chargers and have not been able to made power usage outrun the chargers ability to keep up...

Yeah, it was a Scosche reVOLT c2, its actually an iPad charger that will supply 2100ma but I have verified that the phone is drawing the maximum amount of power it is capable of. I did read on another thread, I believe it was from Ollie, that it take a few weeks for the battery to get broken in so that may be one issue. I will repeat the test again in a month to see if it is the same results and report back.

[JD_Racer_Dad]

I know, too much time on my hands. I searched your Scosche reVOLT c2 and ATT specifically referenced it in a tech problem about not charging correctly and the iPhone compatibility issue. In that tech report they recommended a Charge Only cable they make just for iPhone protocol chargers.

This is the ATT cable they sell for non iPhone chargers:
Buy.com - AT&T Micro USB Data Charging Cable Black

Newegg and Amazon have reviews about it not charging non iPhones as well. The amazon one is under the "retail packaging - black" item.

With all this all this looking around I did find that many of the 2.1/1.0 Amp chargers are setup with iPhone on the 2.1 and Non iPhones on the 1.0 Amp side.

The Galaxy is 1.0 Amp.

[valeres]

I may have forgot to mention that I was using a charge only cable, The Galaxy is up to 1.0A@5vdc but according to everything I have read it isnt supposed to draw any more that 750ma whereas I have mine confirmed at 890ma. the meter I used to measure this is called a "Watt's up" meter it has a resolution of 0.01v (+/- 1%). Basically Im saying that my setup isn't in question but good info on the charger to have. You probably also know this that a device will only draw as much amperage as it need and is typically regulated at the charging level.

One thing Im going to do in the future, simply because Im just that obsessive, is to make a test rig to measure actual battery draw from the battery in different scenarios. This would be helpful in determining how much extra battery is actually used when 4g is enabled vs 3g and how much WIFI and GPS actually draws

[JD_Racer_Dad]

Good deal on the charge only cable.
I did see a bunch of the duals charge non-iPhones from one and not the other outlet.
Does your S3 show USB or AC charge?
It's in settings, Battery.

[valeres]

it says 77% - Charging (AC)

Also do you know if that cable on Buy.com has the data pins shorted? Otherwise it wont fast charge (AC) a Samsung phone from my understanding

[JD_Racer_Dad]

valeres, not sure about the shorted pins. I didn't see anything anywhere in the tech stuff.
I just found the reference on ATT site.
The gist was Blackberry phones needing more amps than the iPhone protocol and the a secondary reference to some other non iPhones too.
It was before the S3.

I forgot about my two wire charge only charger and cable I had at work.
I tried it yesterday and it worked at the desk with the Charging (AC) but not sure if that indicates whether its is slow or fast.
I was working but thought it was still slow.

[valeres]

If it says AC mode then it can input up to 1000ma (1A) depending on what the charger can deliver, USB mode is up to 500ma. Some computer USB ports will only delver 100ma.

I was asking about the data pins in case you had one of those cables, Im not sure if it is true or not about the data pins being shorted, the custom cable Im using has them shorted. This weekend i will do some experimenting to see if it actually makes a difference, I might even see if i can make a dock mode trigger cable too, I think it would be pretty cool to have a switch box to select the type of dock mode you want, desktop vs car or normal.

[JD_Racer_Dad]

Found two Wikipedia tech pages of interest.
Liked the 2007 and 2009 USB agreement history for mobile devices.
USB
http://en.m.wikipedia.org/wiki/Universal_Serial_Bus#Power
and
http://en.m.wikipedia.org/wiki/USB_On-The-Go#section_6

[JD_Racer_Dad]

To date my Verizon Generic Dual USB car Charger I had for my LG Alley works well.
Charging while I using it.

The Verizon Dual Car charger I had for a Droid 2 works as well.

Both without a charge only cable.

The dual USB Griffin Powerjolt Dual Universal USB Micro does not.
It was in AC mode while charging.

The Qmadix QM-DMCH-4.2-AP USB Twin Tablet Charging 4.2Amp Kit does not.
It was in AC mode while charging.

Both caused my phone to heat up and the two at the top did not.

I use one USB port for the phone and one for my backup hands-free.
I have one more coming, I ordered before I had tried my older Verizon Generic
It claims one port is iPhone protocol and one not.
The iPhone side should work on my backup hands-free. We will see.