This 36V li-ion battery charger output 42V 2A with dc2.1mm head works well with 10S li-ion nominal 36V battery packs for electric skateboard, electric bicycles. The charger 42V 2A effectively optimizes battery performance and extends battery life span. It is a quality 42 volt battery charger designed to meet safety requirements regarding safety distance, fire hazard, flammability rating, structural integrity, safety interlocks, etc. The charger 42V 2A has been tested and approved by Nationally Recognized Test Lab(NRTC)( UL File #E491233, TUV CE File # 50079152 001, Model #IN4252000).