Jabra Engage Battery Pack - For Wireless Headset - Battery Rechargeable - 3.8 V DC - 290 mAh - Lithium Ion (Li-Ion)

3.8 V DC battery - Ensures a steady and uninterrupted supply to your wireless headset Solution for a battery that is about to expire, so you can replace it whenever needed Smaller and lighter than other rechargeable batteries, proving ideal for portable devices