For us, the speakers that amazed us the most with its battery life were being Bose, Ultimate Ears, and Turtlebox. In addition, you want to look at how the battery holds power around time. Will the hrs slowly and gradually dwindle down after a year of use? Two years? https://www.bluetoothspeaker.top/outdoor-waterproof-bluetooth-speaker-high-powered-subwoofer-battery-powered-sound/