We tested Bluetooth speakers with expert listeners, and we concealed the identities from the speakers to remove bias. For all twenty five speakers we tested, the average battery life was a little under seventeen hours. The Sony Ult Area 7 wins the title for best battery life (30 hours). https://www.bluetoothspeaker.top/top-sell-wireless-bluetooth-speaker-portable-outdoor-bluetooth-speaker-with-rgb-light/