Thank you for taking time to leave your review and letting us know the problem.
In this case, could you please try different charging cables with our battery and charge your S3 for a couple of hours to see how it works? Also, could you try our battery with your other devices for double checking?
Would you please email us at firstname.lastname@example.org with your Amazon order # and the review? We will take responsibility for exchange or refund per your preference.
Hope to hear back from you soon. Thank you for your cooperation on this matter.
AnkerDirect Customer Service Team
Mon-Fri 9am to 5pm(pst)