As a result of all the challenges faced by Tesla, its long-time partner Panasonic is also bearing losses. It has lowered its full-year operating profit forecast for its battery unit to ¥115 billion ($771 million) from ¥135 billion, as the demand for Tesla EVs in North America slowed down. Shares of Tesla Inc (NASDAQ: TSLA) have dropped by 4.79% on Monday following the news about its major battery supplier Panasonic Holdings Corp (TSE: 6752.T) slashing its domestic electric battery production by as much as 60%. The Japanese electronics giant explained the…