Synergy Digital Speaker Battery, Works with Logitech UE MegaBoom 2 Speaker, (Li-ion, 3.7V, 2600mAh) Ultra High Capacity, Compatible with Logitech 533-000104, F12431581 Battery - Walmart.com
CameronSino Battery for Logitech UE Boom S 0012 fits Logitech 533 000105 NTA3083 Speaker Battery 2600mAh/9.62Wh 3.70V Li ion|Digital Batteries| - AliExpress
533-000105, NTA3083 High Capacity Battery for Logitech UE Boom S-0012 – SMAVtronics