GM is blaming the drop in Volt sales from 1529 units in December 2011 to 603 in January 2012 on a bad publicity regarding the battery fires that occurred when crash testing the vehicles. Probably is a factor. But the realization that the weak performance of the batteries during winter conditions may also have had a negative effect. More so on the Leaf than the Volt as the Leaf has no IC engine to take over when the battery runs out of juice. Leaf sales in December were 954 dropping to 676 in January.