When looking at the risk vs. reward balance, QuantumScape (QS 7.46%) might offer the wildest range of any company out there. QuantumScape is hard at work developing its technology for solid-state batteries -- a type of battery that no company has produced at commercial scale for the electric vehicle (EV) market yet. If it succeeds, it will be a game-changing breakthrough for EVs, but for now, the company lacks not only profits, but any commercial revenue at all.That should change in time, but what should ma ...