A good general guideline may be the larger the speaker, the longer the battery life. But this isn’t always correct, factors like much more updated Bluetooth firmware versions can significantly impact power efficiency, and a large Bluetooth four.0 speaker won't very last as long as you’d anticipate relative to https://www.bluetoothspeaker.top/outdoor-portable-supports-tf-usb-fm-aus-wireless-5-0-bluetooth-speaker/