Battery makers and electric vehicle (EV) manufacturers have seized on the Beijing Auto Show to showcase technologies promising shorter charging times in a race triggered by BYD and Contemporary Amperex Technology Ltd (CATL).Fast-charging technology has dominated the floor at the 10-day event which runs until May 3. Second-tier Chinese battery suppliers including CALB Group, EVE Energy and Sunwoda unveiled products capable of boosting power to 70 per cent, from a starting point of 10 per cent, in under 10 minutes – pushing charging times into the single digits.Sunwoda extended the technology to electric bicycles, presenting a battery that charges from…