triangles wrote:Hate to be the bearer of bad news but I hope you are still under warranty. I consider it a design flaw that the FFE does not log when something doesn't shut down like it is supposed to. Either that or have it designed such that one module controls access to the 12V battery. Your problem is some module is not shutting off when the car turns off. Unless it is repeatable or the mechanic happens to catch it in the act of misbehaving it is impossible to troubleshoot the cause. If you just replace the battery you may be wasting money as a strong new battery may mask the problem as it may be strong enough to keep from going dead as quickly. Search my other posts for information on this problem.
Carbuff, I respectfully disagree. My last two Motorcraft batteries lasted 9+ years. 1 died after 9 years. The other I replaced after 9 years and ended up going into my '68VW when its battery died. That motorcraft was still working at 10+ years old when I sold my VW. I speculate it's the over abundance of electronics in modern vehicles are what's killing the batteries after only a few years. Although I'll admit it also could very likely be a case of they don't make em like they used to.
Triangles - I believe it is the over abundance of electronics. On all of my modern cars, batteries are only lasting 3 years maximum. Notice how hard it is to get a battery with a warranty longer than that? The battery manufacturers have figured it out!! The battery in my 65 Buick lasted ten years. That battery never failed to crank the engine, even if it sat for weeks between starts. I think I hastened it's demise by allowing one of the cells to go dry. Ditto for the batteries in my f-in-law's classics. Never a problem.
GONE - 2015 FFE, Magnetic with leather interior, debadged & tinted
38,500 miles (since May 2015), average 246 Wh/mile
REPLACED WITH - 2018 Tesla Model3, LR RWD, Obsidian Black
11,000 miles (since Nov 2018), average 235 Wh/mile