I just bought a new Smart electric (2016 with 4k miles) on it and I am paranoid about the battery life and care. Actually If I read correctly if the 12 volt battery goes dead it can kill the traction battery. Is that correct. Didn't make sense as what happens when you need to replace the 12 v battery. Other question is I live in Donna, Texas just a couple of miles from the Mexican border so summers are very hot. Usually 100 to 105 every day. I don't drive very much. Usually only a couple of times a week to the store and a few other places as I am retired and an old fart. What is the best thing I can do to extend my traction battery life. Just open to suggestions. Thanks in advance.