http://www.designnews.com/document.asp?doc_id=261882&cid=NL_Newsletters+-+DN+Daily&dfpPParams=ind_184,industry_auto,aid_261882&dfpLayout=article&dfpPParams=ind_184,industry_auto,aid_261882&dfpLayout=article Interesting read. major points I took out of it: 'Temperature' is most important. high temp env=bad for battery. cold temp env = good for battery! That really sucks for those buying in Vegas, NM, AZ, FL, etc etc, while thats really good for those living in mid-northern states, canada, norway, etc. Fast charging (supercharging) also not recommended often. degrades battery much faster. for maximum battery life, Lithium-ion battery packs need to stay as close as possible to a 50 percent charge, usually going no higher than 80 percent and no lower than 20 percent. If that is all really true, I would like to to see an option in my Model S to have a "max battery charge" capacity were I can set it to 60-70% instead of the "standard charge" that is 90%. I don't need 241 miles daily. I only need about 100 miles max for daily usage. I'd rather have my daily drive go from 70%-30% than 90% to 50% if that maximizes battery life. I'd really love to hear Tesla engineers comment on this and whether or not they think that is true and if so could they provide this 'max % recharge' feature.?