China’s 10% additional tariff on vehicles with engines  larger than 2.5 liters imported from the U.S. took effect Feb. 10.

The average price of lithium-ion battery packs has fallen the most in seven years,  a development likely to accelerate price parity between electric vehicles and gasoline-powered cars.

China’s Guangzhou Automobile Group Co. said it has developed the world’s first car engine that runs on ammonia, adding to new energy solutions that reduce carbon emissions.