Galaxy S4 Extended Battery : Stalion Strength Extended Battery & Back Door Cover for Samsung Galaxy S4 [24-Month Warranty](Jet Black) Double Lifetime 5200mAh Battery with NFC Chip + Google Wallet Capable Replacement Extended Cover & Extended Battery Model B600BU, EB-B600BUB, and or EB-B600BUBESTA for Samsung Galaxy S4 S IV i9500, I9505, M919 (T-Mobile), I545 (Verizon), I337 (AT&T), L720 (Sprint), R970 (U.S. Cellular/MetroPCS), Not for Galaxy S4 Active. Built-in IC chip prevents overcharging. Full NFC functionality. Guaranteed to fit any version of Galaxy S4. This battery is equipped with an NFC antenna, allowing your handset to communicate with other devices and accessories equipped with NFC technology. Battery Specs. Capacity: 5200mAh. Battery type: Lithium Ion, Voltage: 3.8V Li-ion. Battery & Door that is designed specifically for your Samsung Galaxy S4. CE and ROHS certified.