The battery onboard lasts around 12 hours. Not the best in the list, but ideal for an entire day of listening �?check out the Tribit XSound Moreover two if you want something with longer battery life for the same kind of cost (while It is bulkier). The chart underneath https://www.bluetoothspeaker.top/unique-outdoor-powered-wireless-professional-box-party-bt-bluetooth-bluetooths-portable-speaker/