The listing, Samsung External Battery Charger has ended.
Samsung External Battery Charger
•Portable, lightweight and easy to carry
•USB Port Output allows you to charge phone directly or provide power to other electronic devices with USB cable (Not Included)
•This wall charger is designed to charge the Samsung i9300 Galaxy S3 battery while not in your phone
•LED light indicator for charging status
•Never overcharge: Automatically stops charging once battery is full