samsung galaxy s3 not chargin from 2100ma Charger
I have bought a new huntkey portable charger (power bank) PBA-6000 with output current 2100ma. But My galaxy s3 is not charging with this charger. And my galaxy S3 can be charged from the regular charger and from USB from PC. So this means there is no issues with the phone. I also have one galaxy grand phone and it can be charged from this power bank. that means there is no issues with the power bank. Also I tried two other huntkey power banks PBA-4000 with output current 1000ma and PBA-2000 with output current 600ma. And with these two I can charge my phone.
Can Anyone tell why my galaxy S3 is not being charged by this charger. Is this due to the high current rating? But if it is so why galaxy grand is charging? can there be any compatibility issue and Is there any solution of this problem?
Thanks in advance.