Cal Fire robot
A Cal Fire robot checks for toxic fumes after the fire. Courtesy Cal Fire

Firefighting efforts continue to improve containment of a commercial structure fire that broke out 11 days ago at an energy storage facility in the Otay Mesa area as property managers and contractors work to stabilize the batteries, officials said Sunday.

Units were dispatched in the early afternoon of May 15 to Lithium Ion Batteries at 641 Camino De La Fuente, a 13,600-square-foot battery and energy storage facility in an industrial part of San Diego County.

“The evacuation order at Grid 0436 has been downgraded to a warning due to improved atmospheric conditions, and the evacuation warning for Grid 0437 has been removed,” Cal Fire officials reported.

A road closure was also in effect at Camino De La Fuente at Paseo De La Fuente, according to Cal Fire.

Although there have been no instances of thermal runaway for over two days, the risk still exists, Cal Fire officials said in an incident update.

A total of 15 personnel are currently assigned to the fire, including one engine and 12 unnamed resources.

Personnel from the San Diego County Department of Environmental Health-Hazardous Materials Division were assisting in the effort.

No injuries have been reported, and the cause of the fire is under investigation.

An expected time of full containment has not been reported.

City News Service contributed to this article.