probe of 787 battery in troubled dreamliner found not overcharged - 3.7 volt lithium ion battery

TOKYO-Japan's transport safety agency said on Wednesday that the lithium-ion battery on the Boeing 787 had overheated during a full-day air carrier flight earlier this month, causing an emergency landing without overcharging.
Japan's transport safety committee chairman Hiroshi Sato told reporters that the aircraft's data recorders showed that the main battery used to power many electrical systems on the aircraft was not overcharged.
This contradicts the agency's earlier findings from the US investigation. S.
Federal Aviation Administration
50 of Boeing's 787 Dreamliner deliveries to airlines were grounded after the ANA flight emergency landing on January. 16.
Boeing has stopped delivering new aircraft until it can solve electrical problems.
The maximum voltage recorded by the battery is 31 volts, which is below the limit of 32 volts, Goto said.
But he said the data also showed a sudden drop in battery voltage for unknown reasons.
Planes don't usually use lithium-ion batteries of 787 choice, and investigators are still trying to figure out what might be wrong.
"It's not that hard, but we're not very familiar with it," said Hou Teng . ".
The Transportation Safety Board said it will also study the auxiliary batteries of the aircraft and compare the data for each battery.
Investigators on both sides are investigating the manufacturer of burnt batteries, GS Yuasa, and inspecting it using CAT scans at a facility of the Japanese space agency. U. S.
Investigators also said they did not find any evidence that the battery was overcharged when a Japanese airline Boeing 787 was ignited on the tarmac at Boston airport.