This is a rechargeable Sennheiser 3.7V 620mAh AHB622540 Battery . High quality and long lifetime, this AHB622540 battery lets you work seamlessly when you are on the move for business trips or vacations. All our Li-ion replacement batteries for Sennheiser AHB622540 Headphone have been tested and proven to match and/or exceed original battery performance and are 100% […]