Reaction 2.0 7.4V 5000mAh 50C 2S Hardcase LiPo BatteryDetails: Fits most 1 8 and 1 10 scale vehicles 3C charge rating for quick, safe recharging Hard plastic case for increased durability and reliability Reaction 2. 0 Dynamite's new Reaction 2. 0 batteries come with all the power and performance you've come to expect from the original Reaction line, but now include a QR code directly on the battery label. You can scan the QR with the Dynamite Dashboard Smart Phone App for an even quicker and easier