I've mentioned this elsewhere, but I've been running a LiFePO4 in my 2012 Prius for 4 years now. Since PDX is fairly mild, and the battery lives inside the cabin, it seems to work well.
Not sure if it would be appropriate for Wisconsin if the cabin gets well below freezing for longish periods of time. If it were me, I'd probably be willing to try it just as an experiment. That's essentially what I did considering I had no other examples of people doing what I had done.
https://www.batteryspace.com/lifepo4...assed-dgr.aspx
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