A friend of mine with a Leaf had his 12V battery crap out mysteriously. Was only a couple of years old, if that, but once he replaced it, all was well. But that got me wondering about the Model 3's 12V lead acid (?) battery hidden under the cover when you open the frunk. Is it maintenance free? Does Tesla say anything about caring for it? What happens when it dies? I live in a hot, very dry, high altitude and it seems traditional lead acid battery lifetimes where I live are worse here than other places. Obviously, this isn't a big concern yet (car is only 8 months old) and a quick search of these forums didn't turn up much of anything---and although there's a little about it on the TMC forum, it's not much---so thought I'd ask the experts!