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what's the lifespan on the battery in these hybrids?

8 years or 160,000 km guaranteed by Toyota

Seriously, battery is constantly charged / discharged to optimize efficiency of the car.
You can drive few km in EV mode (zero emissions, stealth mode). Useful if you are often arriving home late and have noise-sensitive neighbours.

Are you still selling your Prius. I am looking for a second hand but hard to find.
Thanks.

Seb

Have a second look at the first post...