What is the battery voltage of the 2004 Toyota Prius?

The 2004 Toyota Prius has a hybrid battery voltage of 201.6 volts.

The 2004 Prius belongs to the second generation, also identified by Toyota’s XW20 model code. Its high-voltage traction battery is a nickel-metal hydride pack made from 28 modules connected in series. Each module contains six 1.2-volt cells, giving each module a nominal voltage of 7.2 volts and the complete pack a nominal voltage of 201.6 volts.

That figure refers to the main hybrid battery, not the separate 12-volt auxiliary battery used for conventional electrical equipment and vehicle control systems. It also represents nominal voltage; the pack’s measured voltage can vary with its state of charge and operating conditions.

The second-generation Prius debuted in Japan in 2003 and reached other markets as a 2004 model. Its battery worked with Toyota’s Hybrid Synergy Drive power-split system, which blended gasoline-engine power, electric propulsion and regenerative braking. The pack’s shallow charge-discharge cycling helped support long service life.