Since mid 2014, Nissan has been using the so-called lizard battery, and I think that so far, these are fine. They also stopped including the charge to 80% option. I am following this on MyNissanLeaf.com and so far NOBODY has had any noticeable battery capacity loss with the lizard cells.
Any Leafs sold in cold weather areas, have a battery heater - which is used during charging to keep the battery warmer than it would be just from charging. Apparently, charging when the battery is too cold is the main issue with the current battery.
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