$QuantumScape (QS.US)$ Solid-state batteries have attractive...

Solid-state batteries have attractive prospects, such as shorter charge times, safer protection, and smaller decay ratios, but mass production is a big problem, and even if it is solved, the yield will be a big problem, so the cost is likely to remain high, preventing large-scale adoption. What's more, if mass production is delayed until a few years from now, new battery technology is likely to replace it.