The ZeniPower Z55 battery is a high-quality, rechargeable coin cell/button battery designed specifically for Sony WF-1000XM3 and WF-SP700N headphones. With a capacity of 65mAh and a voltage of 3.7V, this Li-Ion battery offers reliable power for your headphones, ensuring a long-lasting and uninterrupted listening experience. Made in China, this battery is a perfect fit for those looking for a reliable power solution for their Sony headphones. Enjoy free shipping and tracking with this purchase.