1240 Miles Range! Elon Musk Shocked With NEW Highest Energy Density Battery! Hit The Market Soon! Lithium-ion batteries seem to have reached their limit in energy density, facing a surge in demand for higher performance energy storage. This is why their energy density hasn't improved much, despite continuous innovation by companies and manufacturers; it hovers around 250 to 300 Wh/kg. This is also why Elon Musk hasn't been able to create a Tesla EV with a range of 450 or 500 miles. Therefore, a battery with 720 Wh/kg is a highly sought-after breakthrough for automakers, as it could enable electric vehicles to achieve a range of 1,240 miles. It is also currently being produced and is just waiting for Elon Musk to place an order. So why could this type of battery transform Tesla? Welcome to Tesla Car World.