550
Honda says making cheap electric vehicles is too hard, ends deal with GM
(arstechnica.com)
This is a most excellent place for technology news and articles.
Also EV batteries have a life expectancy of 200k miles. Most people consider 100k to be a cars retirement age, so I think the battery problem isn't as big of an issue as we think. Your car is statistically likely to be worn down or wrecked by that amount of mileage.