Recently I lost some of my confidence in my Volt when it died on the side of the road. It turned out not to be the traction battery, thank goodness, and I'm back on the road with the Guessometer predicting 43 miles from the battery this warm June morning. But after this breakdown occurred I started reading more posts on this forum and I see that replacing the traction battery can be very, very expensive. My Volt is no longer under warranty due to its age (it's a 2013 put into service Jan. 31, 2014), although it only has 63,000 miles on it -- most of those miles on electric. So lately I've been wondering -- why do some Volt traction batteries seem (from accounts I read on this forum) to fail or die "early"? Were/are they defective, i.e., improperly constructed, or was it something in their treatment, something in the way they were driven, or were the conditions/temperatures somehow destructive? Do we have any actual figures as to the percentage of Volts that have suffered traction battery failure and how old or how many miles those batteries had on them when they failed? Are there any good statistics about this or is all the information anecdotal? And, is there some indicated point at which I should sell or trade in my Volt, while its battery is still (apparently) in good shape?