Samsung Galaxy S III Battery Replacement - iFixit Repair Guide
Samsung Galaxy S3 Replacement Battery (2100 mAh) for AT&T, Sprint & T-Mobile Models (Discontinued by Manufacturer)
Samsung Galaxy S3 S III Mini Original OEM Battery - Non-Retail Packaging - Black (Discontinued by Manufacturer) : Cell Phones & Accessories - Amazon.com
3200mAh External Backup Battery Power Case w/Cover for Samsung Galaxy S3 Black | eBay