Sorry if this has been discussed before, I looked but couldn't find anything. Does anyone know what constitutes a failure that would result in the Volt battery being replaced under warranty?

There appears to be some consternation over a similar issue at the Leaf forum. Apparently Mark Perry, Nissan's Director of Product Planning made the following statement,

“The warranty is not related to battery capacity. The warranty is related to motor output. So if the battery has degraded to a point where the motor can’t get enough power from the battery, then it’s a warrantable event. But if someone abuses the battery – parks it outside in 140 degrees and all that – and they have 60 percent capacity after eight years, that’s on them. They abused it.”

Taken at the extreme, this could mean Nissan will not have to replace the battery as long as it has enough juice to power the the Leaf for even a short distance. I believe Nissan to be an upstanding company so I can't believe they will actually do this, but statements like this don't do anything to build confidence.

More at:

http://nissan-leaf.net/2010/10/26/ni...rranty-update/