Capacity: 4000mAh 8C 7.4V, perfect for Spektrum DX9 DX8 DX7 DX6E transmitter. Professional Crazepony LiPo Battery, made by high quality Lithium Polymer raw materials , durable for long-lasting use. 4000mAh 2S lipo battery provide high quality, reliable power for your Transmitter . Attention: Don't over-charge, or over-discharge batteries. Don't put it beside the high temperature condition. Don't throw it into fire. Don't throw it into water. About this item Capacity: 4000mAh 8C 7.4V, perfect for Spektrum DX9 DX8 DX7 DX6E transmitter. Professional LiPo Battery, made by high quality Lithium Polymer raw materials , durable for long-lasting use. 4000mAh 2S lipo battery provide high quality, reliable power for your Transmitter . Parameter: Weight : 148.77g; Dimension(LxWxH):71*47*17mm Package.