The issue you have isn&#x27;t with Li-ion -- it has one of the best volumetric energy densities of all commercially available technologies today. [0] Even experimental technologies don&#x27;t promise more than 2x.<p>No, your issue isn&#x27;t with Li-ion, your issue is with <i>physics</i>. As long as power draw stays within an order of magnitude of current mobile devices (note: backlights and radios put a hard lower-bound on this, and devices are already approaching it asymptotically) your dream is not possible without some different technology altogether.<p>One of those different technologies might be remote wireless charging.<p>[0]: <a href="https:&#x2F;&#x2F;upload.wikimedia.org&#x2F;wikipedia&#x2F;commons&#x2F;c&#x2F;c9&#x2F;Secondary_cell_energy_density.svg" rel="nofollow">https:&#x2F;&#x2F;upload.wikimedia.org&#x2F;wikipedia&#x2F;commons&#x2F;c&#x2F;c9&#x2F;Secondar...</a>