EZOPower Standard Lithium-Ion Replacement Battery - 1750mAh For AT&T Nokia Lumia 820 4G Window Phone Brand new EZOPower Standard Battery. Model # EZPBA37S, Capacity: 1750mAh NONE NFC (Near Field Communication) Function Battery type: Lithium-Ion. No memory loss effect. Integrated microchip prevents overcharging & lengthens battery life Compatible with AT&T Nokia Lumia 820 4G Window Phone