New Delhi/Bengaluru, Aug. 11 -- A Chinese-owned electric vehicle (EV) battery maker with origins and base in Japan has picked up a stake in Tata Group's flagship EV battery company, and appointed its top lawyer to its board of directors.

Yokohama, Japan-headquartered AESC Group Ltd bought a 12% stake in Agratas Energy Storage Solutions Pvt. Ltd for Rs.66 crore in March 2025. Tata Sons invested Rs.484 crore for 88% stake, according to Agratas's filings with the ministry of corporate affairs thatMinthas seen.

Alongside, Gordon Louis Chin, general counsel of AESC Group, which is owned by Chinese energy technology company Envision, was made a director on Agratas's board. Tata Group chairman N. Chandrasekaran and P.B. Balaji-Tata Motors chie...