The Priuses have a 12v AGM lead acid battery (about the size of a small motorcycle battery) to power the computers when you hit the power button. They don't hav

The Priuses have a 12v AGM lead acid battery (about the size of a small motorcycle battery) to power the computers when you hit the power button. They don't have a starter. Instead, the 200v NiMH traction battery spins up the CVT, which spins the engine's crank shaft and to start it they simply apply spark to the plugs. The Prius Prime has the above batteries plus a separate Li-ion battery that can be charged overnight from an outlet at 120v or 240v.