The damaged lithium-ion battery from All Nippon Airways' Boeing 787-8 has been sent to Japan's space agency for checks.
Investigators from the Japan Transport Safety Board (JTSB) are conducting CT scans on the battery at Japan Aerospace Exploration Agency's facility, in an attempt to find out what caused the battery malfunction on 16 January.
The checks started on the afternoon of 22 January, says a JTSB official.
JTSB is investigating the problematic 787 together with teams from the US National Transportation Safety Board (NTSB), the US Federal Aviation Administration (FAA) and Boeing.
Japanese battery maker GS Yuasa also confirms that investigators from the JTSB and FAA are inspecting its headquarters in Kyoto, where the 787 batteries are manufactured.
Japanese safety investigators said on 19 January that the 787 battery overheated and sprayed burning electrolytes in a compartment beneath the cockpit because it was overcharged. Pictures of the damaged battery box revealed a charred interior, which is said to weigh 4kg (8.82lb) less than an undamaged unit.
On 20 January, the NTSB said that the battery that starts the auxiliary power unit was not overcharged, when it spread smoke and flames inside a small compartment of a parked Japan Airlines 787 in Boston on 7 January.
The ANA 787 incident led regulators worldwide to ground the 787 on 16 January until Boeing is able to demonstrate that the batteries are safe.