One of the most well known for its large 82 kWh battery is the BYD e6. But the vehicle's boxy design has been likened to having 'the aerodynamics of a biscuit tin'. This leads to an interesting trade off between battery capacity and efficiency. First, the large battery gives a lot of energy reserve, and the peace of mind that can come with that for long trips. Poor aerodynamics, however, mean that a large portion of that energy is being used fighting air resistance, particularly at highway speeds. It also questions the vehicle's overall efficiency and whether BYD's use of a larger battery to mask poor aerodynamics is a good design choice or a band aid to a core problem.