Is QuantumScape a Buy After Battery Breakthroughs?

Shares surged on recent news. These buyers should have been asking more questions.The past few weeks have been wild ones for QuantumScape (QS -3.66%) shareholders. After it drifted to a multi-year low in April, something suddenly lit a fire under this electric vehicle (EV) technology stock in late June. Shares were up by more than 200% less than a month later.That something was a breakthrough in how the company manufactures its high-performance EV battery packs. A key step in the process can now be complete ...