MUNICH, Sept 22, September 2021; Reuters reported that battery power may be the frontrunner 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 (BMWG.DE) and Audi (VOWG_p.DE), which are developing hydrogen fuel-cell passenger vehicle prototypes alongside their fleets of battery cars as part of preparations to abandon fossil fuels.