Gen 2 Batteries Dying

We have a lot of survey and threads on Gen2 batteries. We do not know failure rates today but around 2012 Consumer Reports did a survey, 2005 MY was about 3% I suspect approaching 10% at 10 years and 150k miles. Only Toyota has the failure rate data and they are not talking.

You want a new Toy batt if you can. You can call Toyota USA for assist. Works in some cases.
HV Battery Goodwill Warranty Listing - Toyota Prius USA | PriusChat

 

Good you just have to keep trying for a while. I do not know if internal policies have changed with the new 3 year warranty

 

eventually, it will be 100%. some people theorize that time is worse than mileage because of the luck of some vancouver hi mile taxi's.

 

WOW, those Civic rates are horrible. And the Prius rates should be encouraging. The worst Prius rate is for the oldest, as would be expected.

 

I've never personally encountered anyone who has had one fail. It's a definite shame for those who have it happen, but I think we're too prone to falling into the worry trap after seeing failure reports online. Sure, there is a significant number of failures but the actual failure percentage out of the number of cars produced should be the focus. I feel that we have nothing to complain about, considering the overall reliability and cost-to-own statistics of these cars. Imagine owning something from Fiat/Chrysler and trying to keep it a while (or just a few years!)--then there'd be plenty of grounds for complaint!

 

Yep. While the chemistry and performance characteristics are essentially identical, and the manufacturer is the same for both, the isolated nature of the "D" cell based Honda subpacks vs. the "joined" nature of the Toyota prismatic modules makes them more prone to imbalance and failure. Couple that with the more aggressive depth of charge (20-80% vs. Prius 40-80%), and it only gets worse. The Honda "patch" uses a more conservative battery management method closer to the Prius.

The 06-08 got immediately worse due to the higher power IMA motor. 09-11 took a complete crap because Panasonic divested its 50% ownership with Toyota. There was also a dramatic reduction in the need for industrial grade "D" cells. Once "Primearth" (80% toyota/20% panasonic ownership) started making Honda packs, their quality took a complete nosedive. It's so bad that Honda extended the CARB warranty to all 09-11 models (10yr, 150K miles) likely to avoid another class action lawsuit.







Merged .

Come on now... Comparison with Fiat/Chrysler is setting the bar WAY TOO LOW

 

Battery life can be significantly extended if they are properly maintained. It's unfortunate that the vast majority of people don't even know that's possible. We are working to change that misconception

 

The hybrid batteries with the highest failure rates seem to involve overheating (obstruction of cooling / blocked vents or living in a hot climate) and infrequent use. Anyone wowed by the price of low mileage vehicle that's approaching 10 years of age should expect to be replacing the hybrid battery. The vehicles that are daily drivers: cabs, rideshare, even long-commute vehicles can surpass 300,000 miles on the original battery. Currently approaching 259,000 on my '05.

 

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Don't be worried about Civic failures - Honda has a different system that's just not as resilient as Toyota's.