DETROIT (Reuters) -- A video that went viral of a burning Tesla electric car has emerged as a public relations nightmare for the company, analysts said today, as the electric car maker lost as much as $3 billion in market value two days after the incident in Washington state.
Tesla Motors Inc. has confirmed that the car caught fire after the driver ran over a large metallic object on Tuesday morning just south of Seattle, causing extensive damage to the front end of the Model S sedan. Emergency officials at the accident said the fire occurred in the electric vehicle's lithium-ion battery.
It was the latest in a string of problems for lithium ion batteries, which are used heavily in EVs sold by various automakers. However, the battery fire was the first for Tesla, the California-based EV maker founded by billionaire Elon Musk.
Musk commented on the incident, and defended the car's performance after the crash, for the first time Friday on Tesla's website.
The fire and resulting publicity sparked a PR nightmare for a company that only makes electric cars, as opposed to mainstream automakers like General Motors Co. that derive only a small percentage of sales from EVs, analysts said.
"The bar is much higher for Tesla," said James Albertine, analyst at Stifel, Nicolaus & Co, who has a "hold" rating on Tesla shares.
"Tesla cannot weather a sustained onslaught of consumer complaints and incidents that could potentially dent the demand curve for the next vehicle."
Before the incident, Tesla's stock had soared almost sixfold this year. Today the shares fell as much as 7.2 percent and closed down 4.2 percent to $173.31 on the Nasdaq.
The video of the burning car was posted online at auto blog Jalopnik and has been widely disseminated by other media.
"Tesla's a very controversial stock and this will give fodder for the bears. They'll say this is going to slow down sales," said R. W. Baird analyst Ben Kallo. On Wednesday, he downgraded the stock to "neutral" for valuation reasons.
He said he saw the fire hurting sales slightly, but he and other analysts still expected strong demand going forward.
This is not the first battery fire in an electrified vehicle, as it followed cases in GM's Chevrolet Volt and Mitsubishi's i-MiEV. Boeing Co. also dealt with lithium-ion battery fires in its new Dreamliner plane earlier this year.
Analysts pointed out that warnings inside the Model S in the Washington incident alerted the driver in plenty of time to pull over and exit, and that the fire never entered the vehicle's interior cabin.
Given that Tesla's Model S and the discontinued Roadster have been driven a combined 113 million miles and that this was the first battery fire, the company's rate of catching fire was still only one-tenth the frequency of conventional car fires, Wedbush Securities analyst Craig Irwin said. He has a "neutral" rating on the stock.
Tesla officials said the battery and the car worked as designed, keeping the fire under control and allowing the driver time to pull over and safely exit the vehicle.
"The fire was caused by the direct impact of a large metallic object to one of the 16 modules within the Model S battery pack," Tesla spokeswoman Elizabeth Jarvis-Shean said.
"Because each module within the battery pack is, by design, isolated by fire barriers to limit any potential damage, the fire in the battery pack was contained to a small section in the front of the vehicle," she added.
The incident report filed by the fire department in Kent, Washington, described how firefighters put out the blaze, only to see it then reignite under the car. The report also said that water seemed only to intensify the flames. Firefighters then used a dry chemical extinguisher to douse most of the fire in the battery pack in the front end of the vehicle.
Analysts for research firm Kelley Blue Book said the road debris likely compromised the vehicle's cooling system, leading to the fire. They also said the current shutdown of the U.S. government would hamper any investigation.
Clarence Ditlow, executive director for the Center for Auto Safety, said there was a "design issue" with the Tesla battery if an object striking the bottom of the car could lead to a fire. The head of the consumer watchdog group called on U.S. safety regulators to set industry standards, including additional protection under the battery packs in EVs.
Tesla's battery pack is made up of small lithium-ion battery cells that are also used in laptop computers, an approach not used by other automakers. The battery pack stretches across the base of the vehicle. In comparison, GM uses large-format battery cells in a T-shape in the center of the Volt.
Panasonic Corp., which supplies the batteries used in the Model S, declined to comment today.
Shift to lithium-ion
The auto industry has been increasingly shifting toward lithium-ion batteries as opposed to the less expensive but heavier nickel-metal hydride battery which is still in use by Toyota Motor Corp. in its top-selling Prius.
GM, the largest U.S. automaker, uses a lithium-ion battery in its Chevrolet Volt plug-in hybrid, while smaller U.S. rival Ford Motor Co. uses the same technology in its green cars, including the C-Max hybrid.
The technology is favored in the latest generation of such cars because the batteries can be made lighter, smaller and in a way that retains capacity longer. Lithium-ion batteries are about half the weight of nickel-metal hydride batteries.