The automotive sector is under increasing pressure to improve fuel efficiency and reduce its dependence on oil. This has led to a major trend towards electrification. However, the solutions enabling this shift must be able to meet stringent demands for high performance, reliability and safety. The development of more efficient hybrid and electric vehicles is ready to take a big leap forward with the high power density, safety and lifespan that ultracapacitors offer. Ultracapacitors can be connected in parallel with batteries to leverage benefits in both energy density and power density to create a more efficient, more robust overall system.