NEW DELHI, July 10 (Reuters) - India's Mahindra & Mahindra could consider investing in a battery-cell company to meet future electrification needs, its CEO said, after the company raised funds for its new electric vehicle (EV) unit at a $9.1 billion valuation. Elena had been improving on a consistent basis and heading towards this type of success for some time. "She was able to show her great potential...