The MTBF (mean time between failures) of the Prius traction battery isn't actually known because there are not enough Prius with 300,000 to 400,000 miles on them yet.
The WARRANTY is for 10 years, 150,000 miles (in CA emission states). Being concerned that the life is 10 years, 150,000 miles is like being concerned that the engine will die at 36,001 miles.
Battery life is just not a concern in the Prius (other than the FUD spread in some quarters).
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