Hyperion Samsung Galaxy Stratosphere II 4G 3500mAh Extended Battery + Back Cover (Compatible with Verizon Samsung Galaxy Stratosphere 2 i415). Extend your talk time on your Samsung Galaxy Stratosphere 2 i415. 3500 mAh Battery Capacity (with Extended Back Cover). Batteries use Hyperion Accessories "A" Grade Lithium Ion Cells. Designed by Hyperion Electronics Accessories. Shipping Same Or Next Business Day. 12 Month Product Replacement Warranty.