Boho Tronics Spare Rechargeable Lithium-ion Replacement Li-ion Extended Battery 3500 mAh W/ Back Case - Compatible With LG Bryce Esteem MS910 4G Advanced lithium-ion technology keeps phone working at optimum performance Extended battery capacity rated at 3500mAh Use as a replacement or secondary battery Easy to install into phone Rechargeable and adds extended life to your phone