panamamike wrote: ↑
Thu Feb 20, 2020 9:56 am
Anyone know how BMW makes the determination that the battery merits replacement? I've seen a few different posts on the subject and it doesn't look like it's straight forward. I've seen references to the Max Kappa as well as the actual miles available at battery fully charged. There have also been cases where they will do the battery reset trick to recapture some range, but that will eventually fail after 6 months. If they do this near the 8 yr. 100k mile market, it would be somewhat disingenuous.
When I first got mine, I was worried that my Max Kappa was lower than anyone else's on this forum (under another post). I took it to the dealer here in the Phoenix area and they ran their own test. They said that the test showed that my battery still had 92% life (that was at 60k miles on my 2014). I didn't believe them, but loved the car and continued to drive it. Now, a year later, my GOM has registered 90 miles a few times because of my driving habits. Even though I drive it like I stole it on the highway, I drive it somewhat conservative on city streets. I haven't even looked at my Max Kappa since then and have lost all "range anxiety."
All that to say, BMW has their own battery test that they use to determine if the battery is bad or not. They didn't give me the detailed results of the test, so it could be BS. I just know that with my better driving habits, my battery will make it past the 100k mile mark with no problem.