Malaysia Airlines モバイルバッテリー飛行ポリシー。

短い回答

Malaysia Airlines is tracked from its official additional-restrictions power-bank section: power banks must be carried in cabin baggage only, are not permitted in checked baggage, are capped at two per passenger, cannot be used or charged throughout the flight, must stay with the passenger and not in overhead compartments, must be kept in a separate bag or protective pouch, are permitted up to 100 Wh, require airline approval from more than 100 Wh up to 160 Wh, and are strictly prohibited above 160 Wh.