Samsung Galaxy S3 Stand and Spare Battery Charger (2100mAh Battery Included) (Discontinued by Manufacturer) Convenience at Your Fingertips The compact and durable design makes it convenient to charge your spare battery at home or in the office to give you extra time to talk, text or email. (2100 mAh spare battery included) The phone groove allows you to use the Spare Battery Charging System as a stand to display your phone in a comfortable reading or viewing angle while your spare battery charges.