The Wonderboom four delivers a pure stability of bass to midrange to treble, which means no devices or voices are unnaturally boosted. For all 25 speakers we tested, the average battery life was somewhat under seventeen several hours. The Sony Ult Discipline seven wins the title for best battery https://www.bluetoothspeaker.top/multi-color-wireless-subwoofer-speaker-inalambrico-bluetooth-speaker/