I have 2 of these, excellent battery life:
AquaAudio Cubo - Portable Waterproof Bluetooth Speaker with Suction Cup for Showers, Car, etc. - Pairs with All Bluetooth Devices + Siri Compatible - 10 hours Playtime/ Built-in Mic (Silver) https://www.amazon.com/dp/B01G7KJV2Y/ref=cm_sw_r_cp_api_.Nuy...