The Toyota Prius requires two batteries: a 12V lead/acid battery and the main hybrid driving battery. The first battery is typical of those found in gas-powered vehicles, while the second is a nickel-metal hydride unit designed specifically for electric vehicles and hybrid electric vehicles.
The Toyota Prius uses Panasonic Prismatic Module batteries for its main energy source. The battery has evolved over the years, from a plastic case used in the first generation in 2000, to a metal one, used since 2004.
GreentecAuto.com offers a wide range of Prius replacement battery packs from which to choose, with prices ranging from $1,000 to about $2,300. Greentec offers battery packs for all three generations of Prius.