Stainless steel cover

The dark object to the right is the cover for the new battery enclosure. It's made of 1/8-inch stainless steel, the material that will be used for the entire enclosure designed to isolate the battery from the rest of the equipment in the electronic equipment bays. "The addition of the new enclosure isolates the battery so that even if all the cells vent, there is no fire in the enclosure and there is no significant impact to the airplane," said said Mike Sinnett, vice president and chief project engineer for Boeing's 787 program, in a statement.