J.S.
Love it - Toyota Highlander (SUV)
Battery is about $10k, I believe for most of the hybrids. (That's dealership price)
Haven't had to replace it, and dealership said if taken care of (not drained completely), it should last the life of the car. Of course, Hybrids haven't been around but 10-15 years....but I haven't heard of batteries just failing either.
Pros to cons....I will break even between year 5 and 7 of ownership (from gas mileage). I hug trees, but I'm not going to throw money away on symbolism.
Motive - I felt it was just part of my responsibility as a member of the planet.
I don't mean that as an obligation - I mean that we recycle paper, glass and plastic at our house. We compost. We drive the hybrid. The other car gets 30mpg and is a small 4 cylinder. Oil changes are synthetic oil. Cleaning solution is vinegar.
All of those decision/actions were motivated by economic/financial considerations, with a splash of "can I do this at the same cost (or a bit higher) and be more environmental?"
We bought O. - because we were in the market; we made a concerted effort to see what fit our needs size wise; AND then we started talking about hybrid versus just gas engine.