This calculator estimates cell-level energy density for alkali-ion or alkali-metal batteries (e.g. Li-ion, Li metal, Na-ion, Mg-ion) based on specifications of the constituent parts. This calculator uses either the 18650 or 21700 form factors as the basis for the calculations. Default values are chosen for typical current Li-ion cells. Adjust the values in the boxes below and press 'Go!' to calculate the results.