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Toyota claims that not one has required a battery replacement due to malfunction or “wearing out.” The only replacement batteries sold—at the retail price of $3000—have been for cars that were involved in accidents. Toyota further claims that the nickel-metal hydride (NiMH) battery packs used in all Prius models are expected to last the life of the car with very little to no degradation in power capability. http://consumerguideauto.howstuffworks.com/hybrid-batteries-none-the-worse-for-wear-cga.htm

[Publius6961]

I knew that. I was being sarcastic.
I have wasted way too much time arguing with ignorant idiots who, to this day, not only claim the absurd $10k figure, but go on to claim when you get rid of a Prius you need to pay a $20k+ "pollution fee."

A neighbor replaced his at 140,000 and somehow he talked Toyota into installing it at cost; under $2500.