Hey there, vintage motorcycle riders, anybody tried a sodium-ion battery in a vintage setup?  They definitely appear to be the way forward having many advantages over the lead acid (since 1859!)  However they have different voltage per cell and resting voltage and a much lower energy density, but smaller capacity motorcycles dont need big cranking amps anyways.  I see some people are putting them in modern machines I'd love to hear if someone has done a long term test in a vintage machine.