The RML Group VarEVolt battery pack currently powers electric hypercars. (Image credit: RML Group) A British firm has received approval to mass-produce an ultra-high-power-density electric vehicle (EV) battery that can be fully recharged in just 18 seconds. The RML Group was granted Conformity of Production certification for its VarEVolt battery on June 2. This government approval signifies that the firm can mass-produce the powerful batteries for EV manufacturers. The certification “und...