Investors are still waiting for a meaningful product advance from Quantumscape. Shares of QuantumScape (QS -6.93%) closed lower today as the development-stage quantum-battery stock reported first-quarter results this morning. Investors seemed to want to see faster progress in the company's battery-cell development. As a result, QuantumScape stock closed the session down 6.9%. QuantumScape still needs time QuantumScape still has no revenue, and its operating expenses increased modestly in the quarter from $1 ...