Repair?
Why are we discussing batteries? They are not involved here. This aircraft has serious fire damage. Those who have done repair of these modern composites know very well, the bonded repair etc hold good for only minor gouges or dents etc. This aircraft will require a complete re-paneling for about 10 to 12 feet of a very highly stressed portion of the fuselage. One picture clearly shows the frames and stringers exposed. Checking for heat damage to surrounding area alone will take weeks. Then these panels that have 3 dimensional shaping and of varying thickness have to be made. Stringers and frames are also of specially formed and shaped. it is not like the older aircraft where one can use raw stock to make splice repairs.
Again we have seen only one picture of the external damage. Inside will be in shambles with wiring, tubing etc burned. Galley and seats charred. Lucky the whole aircraft did not go up - thanks to the efficient response of fire dept.
Boeing will do anything to prevent a hull loss. Aircraft will have to be on a jig and leveled for repair. Ethiopian can forget about this aircraft for 5-6 months - if Boeing is doing the job. They will be better off looking for a lease to fill the gap.