Synergy Digital Speaker Battery, Compatible with Harman/Kardon Onyx Studio 5 Speaker, (Li-ion, 3.7V, 3500mAh) Ultra High Capacity, Replacement for Harman/Kardon ID997 Battery
Specifications: Battery Chemstry: Li-ion Voltage: 3.7V Capacity: 3500mAh Compatible with: Harman/Kardon ID997 Battery Works for: Harman/Kardon Onyx Studio 5 Speaker and many more