In the doomed flight, fire erupted in the cargo bay six minutes after leaving Miami.
The Dreamliners were grounded after a battery in a Japan Airlines 787 plane caught fire in Boston, while an All Nippon Airways flight was forced to make an emergency landing because of a battery malfunction earlier this month.
The 50 Dreamliners in service have been grounded since 16 January, after a battery in a Japan Airlines 787 plane caught fire in Boston, and an All Nippon Airways flight was forced to make an emergency landing because of a battery malfunction.
In 2010, fire caused a 787 test flight to lose primary electrical power while flying from Yuma, Arizona, to Laredo, Texas.
The plane's flight crew was aware there was fire in the cabin but could do nothing to stop the dive.
But on Sunday the National Transportation Safety Board completed its examination of flight recorder data from the jet that caught fire in Boston, and determined that the affected battery did not exceed its designed voltage.
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Speaking about the January 7 fire in Boston, Hersman said the plane's flight data recorder showed the battery underwent an unexplained drop in voltage from 32 volts to 28 immediately before the incident, as the plane was being serviced on the tarmac.
Another one executes a terrifying circle in the air before resuming its upward flight, a plume of smoke and fire thundering out behind it.
Earlier this month, a battery in a JAL 787 plane caught fire, while an All Nippon Airways flight was forced to make an emergency landing because of a battery malfunction.
BBC: Dreamliner: Japan's airlines say they changed batteries
In the incident aboard a Northwest Airlines flight making its final approach to the Detroit, Michigan, airport, a 23-year-old Nigerian allegedly attempted to detonate explosives hidden in his underwear, setting off a fire at his seat on the flight from Amsterdam, Netherlands.
Rubinstein was hunting near the crash sites of two airplanes that went down in the same area: Eastern Flight 401, a New York flight that crashed as it prepared to land in Miami in 1972, and ValuJet Flight 592, a 1996 flight to Atlanta that caught fire shortly after takeoff and plummeted into the remote swamps west of Miami.
But two batteries failed after fewer than 100, 000 hours of actual flight, one leading to a fire aboard the 787 on the ground in Boston.
The testing concluded there was no chance that short-circuiting would lead to a fire, and the odds of a smoking battery were one in every 10 million flight hours.
It was the battery toward the rear that caught fire and gushed smoke on the plane in Boston, which had recently landed after an overseas flight.
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