Ridstar-Q20 Pro DU 52V 40AH. high speed Dual motor + 40AH battery. high speed motor + 20AH battery. high speed motor + 15AH battery. 【Ultra-long Range 52V 40AH Battery】 The Q20 pro electric dirt bike for adults is equipped with dual 52V 20Ah batteries (total of 40Ah), which are UL certified and have a BMS system.