Boeing has begun replacing batteries on its fleet of grounded 787 Dreamliners following approval of the modified design from the Federal Aviation Authority.

All 50 aircraft presently in service around the world have been grounded since earlier this year following a series of onboard incidents.

Production of the aircraft has also been halted at Boeing worked to address safety concerns.

All Nippon Airways, which operates 17 of the planes, the largest fleet in the world, will have the batteries replaced on its aircraft first.

The carrier will have to wait for approval from various regulators before they can start to fly the planes commercially.

The FAA, which approved the battery design last week, has said that it will issue a final directive on the Dreamliner this week.

The plane is the first in the world to use the lithium-ion batteries, which are lighter, hold more power and recharge more quickly.