Hyperion Samsung Infuse 3500mAh Extended Battery (Compatible with Samsung Infuse i997) Designed and Manufactured by Hyperion Electronics Accessories. 3500 mAh Battery Capacity (with Extended Back Cover). Batteries use Hyperion Accessories "A" Grade Lithium Ion Cells for optimum performance. Take full advantage of your Samsung Infuse's 4G network capabilities by making sure your new Samsung Infuse 4G has the power to keep on going. Customer Satisfaction Money Back Guarantee.