The Prius had a NiMH battery. Current production Priuses (Prii?) almost all* use lithium-ion batteries, from the 2016 model year (fourth-generation/XW50) on.

The Prius had a NiMH battery. Current production Priuses (Prii?) almost all* use lithium-ion batteries, from the 2016 model year (fourth-generation/XW50) on. * A subset of fourth-gen Priuses, those equipped with all-wheel drive, went back to NiMH for better cold-weather performance.