Here is a copy of a blog. i have bought 6 battery's in 4 years. i have been stranded with the family late at night paid for many tow trucks. taken my car to infinity dealers with no success. please read this blog.. https://x.infinitihelp.com/forum/showthread.php/2011-m37x-battery-problemsi-7942.html 4 pages of peolple having the same issue with there infiniti. i am told i have to pay for a 1200 module that maybe will fix the problem. this is not a problem that anyone would notice in the first couple of years because you think the battery is at fault. infiniti fix the issue in 2014 but did not do a recall on prior m37/56.