Solid-state battery maker QuantumScape (NYSE:QS) is living on borrowed time. It may be time to pitch QS stock. The prototype electric vehicle battery exceeds expectations in testing but is far from being ready for commercial use. The delays are causing concern for QuantumScape’s major partner and potential customer. Over the past few years, Volkswagen (OTCMKTS:VWAGY) invested more than $300 million into QuantumScape while also infusing more capital into a joint venture between them. Volkswagen is also the p ...