Here's the battery pack behind VW's global electric-vehicle push

VW Battery PacksNo single core component in an electric vehicle costs more—or probably matters more for the acceptance of EVs—than the battery pack. Many would argue that one of the best decisions Tesla ever made was going with the Panasonic 18650 cells in the Model S (and later, Model X). Thanks in part to good power management and thermal planning…
Source: Hybrid and Electric Car News and Reviews