Fast charging is viable, but experts say building the actual charging stations will be the tricky—and potentially very expensive—part.

Chinese electric vehicle manufacturer BYD has revealed new fast-charging tech that can add 400km (249 miles) of range from a five minute charge. With the announcement, BYD has also promised to make a major investment in charging infrastructure, building over 4,000 of the new fast chargers across China.

The tech inside BYD’s new electric SUV is far ahead of the rest of the world. Filling an empty gas tank in an SUV might take five or six minutes. A new electric SUV from China’s BYD can charge its battery in roughly the same amount of time,