This is a very fair point. It is sad though, that it's true for BMW that there is no instantaneous way to measure a capacity of the battery pack. It is not necessarily true for other brands though. E.g., Nissan LeafSpy provides a very accurate estimate of battery capacity at any moment, and this estimate closely matches the dashboard battery capacity indicator in bars, the latter triggering a battery warranty whenever there's less than 9 bars remaining. All these also match the outcome of battery capacity assessment using more rigorous tests via slow discharging and charging of the battery. And Leaf has had this capability from the onset, it's not that BMW had to invent a wheel.alohart wrote:It is true that there is no instantaneous way to measure a capacity of any battery pack (many different capacities exist depending on conditions). So it would be difficult to provide an i3 driver with a definitive pack capacity.
I doubt BMW don't have algorithms to estimate the battery capacity by voltage range etc. at any given moment, since Nissan has used them since 2011. I just think it's a lot more convenient for BMW to communicate they don't. And to obscure the process of battery capacity verification and its outcomes in every possible way.