Synergy Digital Speaker Battery, Works with Logitech S715i Speaker, (Ni-MH, 3.6V, 1500 mAh) Ultra High Capacity, Compatible with Logitech 180AAHC3TMX Battery - Walmart.com
Battery suitable for Logitech S715i Speakers(1600mAh, 3.6V, NiMH) - Electropapa