Yes. The Toyota Mirai, a hydrogen fuel-cell vehicle, uses a small high-voltage traction battery and a conventional 12-volt auxiliary battery in addition to its fuel-cell stack.
The question matters because hydrogen-powered cars generate electricity on-board, but they still rely on stored electrical energy to smooth power delivery, start systems, and run accessories. The Mirai is not a plug-in vehicle; energy is replenished through hydrogen refueling and regenerative braking.
How the Mirai's propulsion system uses a battery
In the Mirai, the fuel-cell stack converts hydrogen into electricity, which powers the electric motor. A compact high-voltage battery acts as a buffer and energy reservoir, absorbing surplus energy during deceleration and bursts of acceleration, and releasing it when needed. A separate 12-volt system handles cabin electronics, lights, sensors, and other auxiliary loads.
Battery components in the Mirai
Here are the key electrical storage components that support the Mirai's powertrain.
- High-voltage traction battery: a compact pack that stores energy for buffering the fuel-cell output and aiding acceleration; its usable capacity is a few kilowatt-hours, enough to smooth power rather than provide long-range electric driving.
- 12-volt auxiliary battery: powers electronics, sensors, infotainment, and starting-related systems, similar in role to the 12V battery in conventional cars.
Note: Toyota does not widely publish exact battery capacities for the Mirai, and specifications can vary by model year. The battery’s purpose is energy buffering and reliability, not as a primary energy source for long-range electric driving. The Mirai remains a non-plug-in hydrogen fuel-cell vehicle.
Battery specifics by generation
First-generation Mirai (2015–2020)
The original Mirai incorporated a relatively small high-voltage battery designed to smooth power delivery and support the fuel-cell system. It was not a plug-in vehicle, so there was no external charging option.
Second-generation Mirai (2021–present)
The current generation maintains the same core architecture with an updated, compact high-voltage battery and a refined fuel-cell stack. Energy is replenished primarily through hydrogen fueling and regenerative braking, with improvements aimed at efficiency and cold-weather performance. The car remains non plug-in.
What this means for drivers
The battery helps the Mirai respond smoothly to driving demands and provides a small energy reserve, but it does not serve as a long-range energy source like a typical electric vehicle battery. Hydrogen fueling remains the primary method of energy replenishment, while the battery supports performance and reliability.
Summary
The Mirai does have a battery—specifically a small high-voltage traction battery along with a 12-volt auxiliary battery. These components buffer energy and support electronics, while the vehicle’s energy needs are met by the hydrogen fuel-cell stack and regenerative braking. The Mirai is not designed for plug-in charging, and its range depends on the hydrogen fuel supply and fuel-cell efficiency rather than battery size.