Cameron Sino 1500mah Speaker Battery S-00100, 984-000134, 984-000135, 984-000142, 993-000459 For Logitech S315i, S715i - Digital Batteries - AliExpress
Synergy Digital Speaker Battery, Works with Logitech S315i Speaker, (Ni-MH, 3.6V, 1500 mAh) Ultra High Capacity, Compatible with Logitech 180AAHC3TMX Battery - Walmart.com