in some states, the warranty
in some states, the warranty for the battery is 10yrs/150k. The cost to replace one is about $2k + labor = 3K. The regeneration happens when your foot is off the gas pedal.. I have the car for 1.5 months now, hybrid in general is no good for very cold winter and snow.. I got like 12 MPG in city driving in a very very cold day (0 degree) and around 35 MPG in above 30+ degree. In 60-70 degree, I got 40+ easily.