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I have an iPod Touch. If I plug it into the AC outlet, with a AC/USB power adapter, the iPod will charge to about 20%, and then stop charging. However, if I plug it into a computer USB outlet (using the same USB cable), it will charge fully to 100%.

Electricity is electricity, no matter where it comes from, so why wouldn't it charge from an AC outlet?

  • your AC-USB is broken! – Ruskes Jan 28 '15 at 0:27
  • Actually, no, it's perfectly fine. And, I have to add that I also use this same AC adapter to charge other items (including an Android tablet and my Samsung Galaxy S4), and NEVER have a problem with it. The problem occurs ONLY with the iPod Touch. I've also tried a different AC adapter, and the exact same thing happens. So, the only common denominator is the iPod. – Jim Kaufman Jan 28 '15 at 4:50
  • Electricity is electricity right up to the point where you look at how it's being supplied in volts and milliamp hours. Just because the charger works with other devices doesn't guarantee that everything will work with it. Simple test: try another AC charger. – douggro Jan 28 '15 at 8:24
  • As you can see from my comment above, I have ALREADY tried another AC charger. Same result. – Jim Kaufman Jan 28 '15 at 14:48
  • Have you tried charging another device on the same AC charger to determine if it works? – Srevilo Mar 26 '18 at 5:25
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It sounds to me like your AC to USB charger is having a problem with heat.

It charges for a while (while heating up) then it stops.

If you let it cool down for a while I assume it continues charging.

In any case, I would suggest replacing it.

  • Actually, no, it's perfectly fine. And, I have to add that I also use this same AC adapter to charge other items (including an Android tablet and my Samsung Galaxy S4), and NEVER have a problem with it. The problem occurs ONLY with the iPod Touch. I've also tried a different AC adapter, and the exact same thing happens. So, the only common denominator is the iPod. – Jim Kaufman Jan 28 '15 at 4:51
  • well now we know :) good investigating work so far. – Ruskes Jan 28 '15 at 5:00

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