Reliable Li-ion battery for Harman/Kardon Onyx Studio speakers. 3400mAh capacity for long playback time. 3.7V voltage for stable and reliable performance. Compact design for easy installation. This battery is specifically designed to provide Harman/Kardon Onyx Studio 1 and 2 with a long-lasting and reliable power source. With a capacity of 3400mAh and 12.58Wh, it offers enough power to keep your speaker running for extended periods. Perfect for both music lovers and those who use the speaker for professional purposes. The compact design and robust construction ensure easy installation and long durability. The battery is blue and has dimensions of 68.25 x 18.60 x 18.60 mm, making it easy to replace when needed. Perfect replacement for Harman/Kardon Onyx Studio batteries. Whether you need to replace an old battery or want a spare battery, this is a perfect option. It is compatible with official Harman/Kardon part numbers, ensuring a perfect fit and optimal performance. Specification - Battery type: Lithium-ion (Li-ion) - Capacity: 3400mAh / 12.58Wh - Voltage: 3.7V - Dimensions: 68.25 x 18.60 x 18.60 mm - Color: Blue. Compatible models: Harman/Kardon Onyx Studio 1, Harman/Kardon Onyx Studio 2.