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I have a Samsung Galaxy Ace 2 x. It only charges when plugged in to the AC adapter and my laptop, and doesn't charge using battery packs or in the car. I use the same cord for everything. Why is this?

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    Not enough current? – agent154 Mar 19 '13 at 2:19
  • I agree with agent, you would need at least 1A charger if you want to charge smartphones nowadays. Even more 2A for a tablet. Your PC cannot supply that much specially if its below USB 3.0 standard. – forums Mar 19 '13 at 6:40
  • my pc is 3.0 usb – josh Mar 19 '13 at 20:37
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Open your car charger and at the back of the USB socket solder together the two middle contacts. These are the D- and D+ signals. Most Galaxy phones don't like an open circuit there, so now you have made a nice loop. Info: http://en.wikipedia.org/wiki/Universal_Serial_Bus

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