Trakpower LiPo 2S 7.4V 4000mAh 50C Hard Case 4mm FEATURES: For electric on and off road cars, buggies and trucks ROAR approved Hard plastic case for protection against the elements and crash damage 4mm female bullet connectors for positive (+) and negative (-) terminals 2mm terminal for balancing Male connectors to solder to wire leads INCLUDES: 2S 7.4V 80C 4600mAh Short LiPo Battery Two 4mm Male Bullet Connectors One 2mm Balance Connector Instruction Sheet REQUIRES: LiPo compatible charger with balancer such as the Duratrax Onyx 235, (DTXP4235) or the TrakPower VR-1 (TKPP5000)