Hyperion Sprint LG Optimus S 3500mAh Extended Battery + Back Cover Extend your talk time on your LG Optimus S (LS670). 3500 mAh Battery Capacity (with Extended Back Cover). Batteries use Hyperion Accessories "A" Grade Lithium Ion Cells. Designed and Manufactured by Hyperion Electronics Accessories. All batteries come with a 3 month manufacturers comprehensive warranty.