The only net result is going to be that the next plane Boeing makes will have certfication difficulties too. This called tit for tat and has nothing to do with safety and everything to do with non-tariff barriers. If it were safety that was really the issue, the guys and gals from Airbus, Boeing, EASA and FAA and NTSB and battery makers and other stakeholders would get together in an ISO setting for lunch, then go into a quiet room, put a word processor on a big screen and write the certification requirements together, and make the battery requirements that are safe in a passenger airplane an independent ISO standard. A standard sets a level playing field.