Ford Took an Early Lead in Electric Vehicles. Now G.M. Is Surging.

In the race to be second to Tesla in the U.S. electric vehicle market, Ford Motor leaped to an early lead four years ago over its crosstown rival, General Motors, with the Mustang Mach E, an electric sport utility vehicle with a design and a name that nodded to its classic sports car.

But the contest looks much different today.

Sales of G.M.’s battery-powered models are starting to surge as the company begins to reap its big investments in standardized batteries and new factories. Ford’s three electric models, including the F-150 Lightning pickup truck and a Transit van, are still selling well but are racking up billions of dollars of losses.