Tesla Club Sweden

In terms of individual models, it seems that the highest rate of battery failures was noted in the early Tesla Model S and Nissan Leaf cars. These cars were very popular in the plug-in segment at the time and inflated the total average:

2013 Tesla Model S (8.5%)
2014 Tesla Model S (7.3%)
2015 Tesla Model S (3.5%)
2011 Nissan Leaf (8.3%)
2012 Nissan Leaf (3.5%)