An All Nippon Airways 787 has reportedly experienced a new battery problem.
A single cell of the plane's lithium ion battery overheated during scheduled maintenance activities and with no passengers on board. The problem was reportedly discovered by maintenance workers, who saw liquid coming from the battery and smoke in the cabin.
In a statement reported by news outlets, Boeing said: “The improvements made to the 787 battery system last year appear to have worked as designed.”
The 787 was famously grounded last year for three months after problems occurred with its lithium-ion battery on a couple of flights. The plane took off again after a comprehensive redesign aimed at reducing the risk of the battery overheating.
The US National Transportation Safety Board (NTSB) is expected to report what caused the problems in a report due by the end of 2014.
This story was updated at 16.12 on Jan 15.