Comparing the BMW E1 from 1991 and the BMW i3 from 2013 shows us how much changed in less than 20 years.
There are different batteries, different materials like CFRP and DC charging capability. However, as InsideEVs found a year ago, there are a lot of similarities between these two BMW EVs.
From the name consisting of one letter and one digit, through to the concept of a four seat electric car, the motor position at the rear axle, the use of light weight materials (aluminum spaceframe and plastic panels in E1)...and so on.
Aren't they rather similar? Here are cutaways of both cars: