Like the 1st-gen model, the battery is replaceable and can be accessed by means of hidden screws on The underside of your speaker. Okay it sounds like you may be having closer to the resolution. For that Bluetooth sound quality challenge specially I might advise checking your Laptop manufacturers https://www.bluetoothspeaker.top/powerful-wireless-speaker-subwoofer-party-box-music-bt-speaker-wireless-waterproof-with-battery/