Apparently these batteries cost ~$100 each, about the same as wheelchair
batteries. See:
http://www.calcars.org/calcars-faq.html
QUOTE:
We have information on standard Prius Panasonic batteries. Their
replacement cost now is under $3,000; they're waranteed for 100,000-150,000
miles in different states. By then, [by the time you go 150,000 miles]
they'll probably cost well under $1,000. We can extrapolate similar trends
for PHEV [plug in hybrid vehicle] batteries. Toyota's Nickel-Metal Hydride
batteries are considered "non-hazardous waste" -- see "high voltage
electrical systems" Toyota has had a battery recycling program since 1998
and even offers dealers a $200 "bounty" to dealers to ensure batteries
aren't just thrown away (described at end of linked document). Lithium-Ion
batteries share many characteristics with Ni-MH.
