REUTERS/Rebecca Cook
- Shares in China's BYD have fallen 14% in the past month as rival Tesla presses ahead with a price war.
- That stock price plunge has erased $18 billion off the Warren Buffett-backed EV maker's total valuation.
- Buffett's Berkshire Hathaway has still made gains of roughly 5,500% on its initial BYD investment.
Warren Buffett-backed BYD has suffered an $18 billion wipeout in value over the past month as rival EV maker Tesla presses ahead with a price war.