Can I get some help with charging issues?

A

AC Question

charging issues

OK here is my question.
I have a S3 and a nexus 7 tablet.
I can charge both devices off a wall charger using the same wall charger and cord.I ca
I can then charge both devices off my lap top....using the same cord that i used with the wall charger.
But if I plug them into my new ampy, or my new 20000mah Double USB Ultra Thin Portable External Battery Charger Power Bank, or my car charger. Using the same cable i used above, Only my Nexus 7 tablet will charge. My S3 won't even recognize it's hooked into a charger.
The 20000mah Double USB Ultra Thin Portable External Battery Charger Power Bank has a 1 and 2.1 amp output. Neither one works!

Can anyone tell me whats going on?
 

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