Choice of battery pack sizes, BMW i production.

Study tip: In a new study, the German Aerospace Center (DLR) recommends that OEMs should offer buyers of plug-in cars different battery capacity options. It suggests that manufacturers should therefore develop a modular platform to offer i.e. battery sizes for drivers with low, average and high mileage requirements.
sciencedirect.com via chargedevs.com

Video tip: BMW lets you take a peek behind the curtain at its production plant in Leipzig and shows how the BMW i8 is build. The manufacturer points out that the hybrid sports car is not only more ecological when driving it, its production process is as well.
youtube.com via mein-elektroauto.com (in German)