If you are looking into this matter, then you probably already have your WF-1000XM4 100% charged. By the way, is your smartphone fully charged? In my case, it needed to be charged to at least 35%.
日本語：バッテリー足りないのはイヤフォンじゃなくてスマホ側でした。mobileって言われてもどちらか分からないよね。スマホ35％にしたら通ります
