Tenergy 11.1V 2700mAh 25C LIPO Battery Pack w/ EC3 Connector for BLADE 350 QX RTF RC Quadcopters Perfect fit for BLADE 350 QX RTF with SAFE Technology Capacity: 2700mah. ONLY use a LiPO Balance Charger for charging this battery. Charging (Balancing) Lead: JST/Align/E-Flite style connector. 24AWG PVC wire, 30mm Long. REQUIRES charger with balance charge function. Dimension: 103mm x 34mm x 27mm