Good on them for being willing to admit a mistake.
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Mark,
I have had bad luck with portable USB 5vdc chargers. I sent for a ( marked Samsung ) 20k mAh charger and though it took a charge it had no output, so of course I took it apart.
First thing I found was the batteries inside could not physically put out more than 8k if it worked!
It was not worth the cost to ship back to China.
So I bought a USB Buddy from PowerWerx. This Buddy will take 10 - 32vdc input, and outputs clean 5vdc at 3 amps! I can run it of all the different batteries I own. Li-ion from my drones to a lighter plug hack I made for my car.
Did I say it icharges at 3 amps? Fast charging indeed.
[1]: http://www.powerwerx.com/adapter-cables/usbbuddy-powerpole-12v-usb-5v-device-charger.html#.VPUHKNNpe7M.mailto
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