Gikysuiz Replacement Battery for Logitech UE MegaBoom Series Wireless Bluetooth Speaker fits Part Number 533-000116 533-000146 7.4V 3400mAh - Newegg.com
Amazon.com: SCESMIA Replacement Battery for Logitech UE MegaBoom Ultimate Ears MEGABOOM 3 984-001362 084-000845 S-00147 S-00171, fits Part No 533-000116, 533-000138 533-000146,7.4V Li-ion 3400mAh/25.16Wh : Electronics