This is a rechargeable Yamaha 3.6V 2000mAh KR4-M4251-002 Battery . High quality and long lifetime, this KR4-M4251-002 battery lets you work seamlessly when you are on the move for business trips or vacations. All our Li-ion replacement batteries for Yamaha KR4-M4251-002 Processor have been tested and proven to match and/or exceed original battery performance and are 100% […]