YESOO S3 BLACK Back Door Cover + 4300mAh Extended Battery + TPU Case For Samsung Galaxy S3 SIII With Exclusive Black And Green Color Key Chain Kit [NO NFC] (BLACK) Cell type: Lithium-ion Voltage: 3.7V Capacity: 4300mah Battery life will vary depending on your specific hardware and software configurations and network conditions. Precise Cutouts Give Full Access To All Ports.