The 2023 Toyota Prius Prime has a 13.6 kWh lithium-ion battery capacity.
That battery belongs to the third-generation Prius plug-in hybrid, introduced for the 2023 model year. Toyota placed the pack beneath the rear seat area, a packaging change that helped preserve the car’s practical liftback layout while substantially increasing stored energy.
The 13.6 kWh pack represented a major step up from the previous Prius Prime’s 8.8 kWh battery. That increase helped raise the EPA-rated electric range from 25 miles in the earlier generation to as much as 44 miles for the 2023 SE trim; larger wheels and higher trims receive a lower range rating.
Battery capacity is not the same as usable energy. A vehicle’s control system normally reserves part of the pack to protect battery life, so the energy available for driving and the electricity drawn from a wall outlet can differ from the headline capacity. Range also changes with speed, temperature, terrain, climate control and wheel choice.