Pulse Ultra PULSE 5000mAh 6S 22.2V 45C - LiPo Battery For 550 to 600size helicopter with 6S config (TRex550L,Goblin570) or 700size helicopter (12S config) True 5C Charge Rates -Large AWG Wiring for Maximum Power Applications Industry Standard JST/XH Balance Taps -High discharge rate for High Power Demands The choice of pro level pl and beyond, filling the flight line with pl of all skill levels&demands Myriads of Voltages, Capacities & C Ratings - Full 90 Days Warranty Period