[Q] Car Charging While Using

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Something I noticed while in my car this weekend for a trip.

I connected my Tab to my phone via wi-fi for internet. It was the first opportunity I got to use the Navigation on the Tab so I gave it a whirl. About halfway through my trip I decided I'd try charging it while running. The charger I have is a Verizon one, has a cable for my cellphone coming out if it, but it also has a USB "port" for charging other USB devices. When I plugged in the Tab, kies came up and it had a charging symbol on the battery. I didn't want kies running and I backed out of it and fired up Navigation again. However, as soon as I exited kies it would not charge. Is it normal for the Tab to only charge while kies is running and it thinks it is in a USB port? I haven't tried it on a real computer USB port to see if it happens there.

Edit, just found this post re: USB on a computer, same thing I experienced in my car, I think:
http://forum.xda-developers.com/show....php?t=1132691

The device is looking for a specific voltage on the data pins in order to put it into charge mode.
Look at my post on how to make your own cables to fix this problem.

/i tried something very similar - it was charging but had a circle with a slash through it on top of the battery and would show the charging symbol as well.

My guess is that it wasnt the correct voltage - but it did still charge. A bit strange

See my post here.

I have a regular AC/DC wall outlet thing that plugs into my power outlet on the dash. Works perfect. 7 bucks at Fry's.