Hello all,
I have a 2013 I3 with range extender and when I got it in 2015, it had 18.2 kwh available when I checked in the service menu. As time goes on this value varies quite a bit but always follows a downwards trend. When it reached around 16kwh one year, I reported it to BMW and after they sorted it, it went up to over 19. Again this followed a steady downwards trend and now I am at 16.2kwh. That is a 2.69 percent loss per year. Range has also decreased accordingly.
What I suspect is happening here is the capacity is being limited gradually by software so that BMW never have to replace the battery within the warranty period. Here is the data I have been recording. I haven't been recording it over the past two years, just observing.
18/10/15 19.4
21/10/15 19.5
31/10/15 19.4
09/11/15 19.3
20/11/15 19.2
29/11/15 18.9
30/11/15 19.2
01/01/16 18.5
13/03/16 18.6
15/04/16 18.5
09/05/16 18.6
17/05/16 18.6
09/06/16 18.6
14/08/16 18.6
25/08/16 18.1
12/09/18 16.2
I have a 2013 I3 with range extender and when I got it in 2015, it had 18.2 kwh available when I checked in the service menu. As time goes on this value varies quite a bit but always follows a downwards trend. When it reached around 16kwh one year, I reported it to BMW and after they sorted it, it went up to over 19. Again this followed a steady downwards trend and now I am at 16.2kwh. That is a 2.69 percent loss per year. Range has also decreased accordingly.
What I suspect is happening here is the capacity is being limited gradually by software so that BMW never have to replace the battery within the warranty period. Here is the data I have been recording. I haven't been recording it over the past two years, just observing.
18/10/15 19.4
21/10/15 19.5
31/10/15 19.4
09/11/15 19.3
20/11/15 19.2
29/11/15 18.9
30/11/15 19.2
01/01/16 18.5
13/03/16 18.6
15/04/16 18.5
09/05/16 18.6
17/05/16 18.6
09/06/16 18.6
14/08/16 18.6
25/08/16 18.1
12/09/18 16.2