Battery power may be the front-runner to become the car technology of the future, but don¡¯t rule out the underdog hydrogen.

That¡¯s the view of some major automakers, including BMW and Audi, which are developing hydrogen fuel-cell passenger vehicle prototypes alongside their fleets of battery cars as part of preparations to abandon fossil fuels.

They are hedging their bets, calculating that a change in political winds could shift the balance toward hydrogen in an industry shaped by early-mover Tesla¡¯s decision to take the battery-powered road to clean cars.