3pete wrote: ↑
Sat Jul 04, 2020 2:31 pm
Agreed that dealers are vague/ secretive about battery health. I honestly think it may be that BMW keeps them in the dark as well and tells them to just listen to what the diagnostic computer says. i3s are still new/rare enough that (most) dealers may not have built up enough experience to know when to question the computer?
So, no, you won't get any "number" from anyone. Just the Battery Kappa, and mine said 12.5, but the BMW dealer said my battery was 92%?
Is your 12.5 a consistent number? If you fully charge up to 100% from something below 50% and check it do you get a similar value?
Alternatively, if you check your batt. ladung values in the secret menu do they agree with the 12.5 total capacity as well? For instance at 40% SOC if you had Batt. Ladung of 5kWh would be 5/0.4 = 12.5 kWh total capacity. If that's consistent, I would try and push the dealer for more information because that seems to be below 70%!
When they tested mine, the computer readout lined up pretty close to my Batt Kapa max and my other calculations, but they were not willing to give me an actual result beyond "it passed" so no percentage for comparison or anything.
As I stated, my 12.5 was from fully charged. I then took it to the dealer and they said my battery was at 92% - did not match what the secret menu Batt Kappa said.
I don't like that BMW keeps all the info to themselves. Nissan, through the Leaf Spy app, on the other hand, gives great details to their users. My workmate, who talked me into this electric car stuff, has a Leaf. His 2017 battery went below 70% under warranty. He was continually monitoring it. When it hit, he took it to the dealer. Because they both had the same information, the dealer replaced the battery no problem. In fact, he got a bigger battery, so now his range doubled!!
If BMW did the same, I think more people would be inclined to buy them. It's a good car, and as I said, I'm not worried about my battery any longer. People on here are getting themselves wrapped up in the Battery Kappa value, but I still don't believe it matches 100% of what BMW is using to determine "battery health."