Apart from using different material for the basic battery technologies to increase the W/KG and Wh/kg , it is also necessary to be able to design batteries in different shapes. The current box type batteries for large capacities and round shaped cells ( AA, AAA etc) for smaller capacities do not serve the form factor requirements of some of the new generation products.
Especially for EVs if the batteries can be packed in the vehicle body itself then there could be great saving in the dead wt of the vehicle.
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