Currently 44,000 miles on the clock, 2015 model. Still on the original battery, which is a reasonably small looking Japanese brand, not a well known brand. I now have a cabin heater and battery charger installed which charges the battery an hour or so daily during the winter so I expect this battery to last 10 years, as long as no one leaves
From what I've seen on these forums, with good maintenance the most common major failure is the hybrid battery, usually between 150-250k (age factors into this greatly - if you can put 300k on a Prius in 5 years, the battery will likely last, but a 2004 model with only 120k is still likely to fail).
But how long do EV batteries actually last and what happens when they die? Menu. #CES2024; Outside of the warranty, a Prius hybrid battery replacement can cost upward of $4,000.
I have 3rd Gen Prius III, 180,000 miles, traction battery runs good, mileage goes down from 51 to 45.6 over 10 years but runs good.” “This is great news. Thanks.

Here is the poll we have going onplease chime in: Hybrid Battery Survey-Gen2 Prius 2004-2009 | PriusChat We obviously do not have internal data from Toyota to be able to answer the question exactly. According to Toyota the battery is designed to last life of vehicle and

The high voltage battery, on the other hand, is what makes the hybrid powertrain “go”, and it’s a nickel-metal hydride unit that should last for 150k miles (or longer). Many first-generation Prius owners have gone over 200k miles without any substantial change to battery performance.
As far as replacement, Toyota's OEM replacement is competively priced with others in the market. Further, Toyota has an 84-month warranty, 24-month free replacement and 60-month proration in a simple two-tier priced plan. Toyota Prius Prime Vehicle Battery - 00544H4052470 - Genuine Toyota Part. O6hAtm.
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    • how long do prius batteries last