Phoenix weather has always been hard on car batteries. That statement could be ammended to say "EV battery packs could operate reliably for 15 to 20 years except where it really hot like Phoenix, Arizona".
Well that depends on if there is an active battery thermal management system, like the one on the volt which can heat or cool the battery pack... Active thermal management will definitely extend the life if you live in either extreme heat or cold climates.
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.