Just read that the battery pack structure or envelope will be made of aluminum ally. Now I am not a Tesla expert (yet ) but isn't the one for the S made of stainless steel ? Aluminum in Québec doesn't last that long if it's not well engineered. See we like to pay taxes so the transportation department can spread a lot of salt and worse, calcium to destroy anything on the road during winter. People who don't live where these products are used cannot begin to imagine what a car looks like after 15 years, parts that you would never change otherwise (and probably NLA by then) desintegrate and the word is not too strong. I speak from experience. Audi, well known for the use of Al may or may not have fixed issues I encountered on my 2001 TTQ. If it were not of my keen eye, I would probably have lost my hood by now. The metallic latch mechanism was mounted directly on the painted surface and with a little help from the grime and calcium and galvanic corrosion, the Al skin started to look link a swiss cheese in no time (6 years maybe). Now I try to keep my cars for 20 years and can usually achieve it but initial enginering needs to give me a chance. I sure hope those californian engineers had a little thought for us and designed this piece to the highest standards. Any thoughts ?