Mumbai: A manufacturing ecosystem for lithium-ion cells is slowly coming up in India, but electric vehicle makers should not expect an immediate cost windfall, according to Vikram Gourineni, executive director at Amara Raja Energy & Mobility.Locally produced cells will carry a minimum 15% price premium over imports in the near term, as it takes time to create a meaningful upstream ecosystem from raw materials to components that China spent two decades building, Gourineni told ET.Until domestic cell makers achieve a scale of 8-10 GWh and a supporting supply chain develops around them, the economics simply will not work in the…