Perhaps you should familiarize yourself with the technology of so-called solid state batteries before pinning hopes on them. Lithium is in very limited abundance in the planet’s crust, and its price keeps increasing. Furthermore, a solid-state electrolyte such as lithium aluminum germanium phosphate (LAGP) costs about $7,500 per kilogram ($16,500/lb).
$7500/kg is $3400/lb. A kilogram is over twice the size of a pound.
If it’s too expensive, then it won’t work. Let’s see.