This is not a Nissan product
This is not a Nissan product and Nissan will not install this for you. If this is added to your LEAF, it is an after-market addition and therefore does change your warranty. I've reached out to Nissan for clarification, but just given the modifications required to tap into the electrical system (http://enginer.us/wiki/tiki-index.php?page=Leaf+Installation+Manual), I'd say that in my opinion, it definitely affects your warranty.