GoolRC 7.4V 2200mAh LiPo Battery for Walkera Devo 7E Transmitter High Quality Transmitter LiPo Battery 7.4V 2200mAh for Walkera Devo7E Transmitter 100% brand new. High quality and durable in use. Easy to install. 2-Cell Li-Po rechargeable battery. Capacity: 2200mAh.