High Quality, high capacity rechargeable battery. No memory effect. Can be charged or discharged as needed without loss of capacity. Overcharge protection, with built-in battery life microchip. Capacity: 280mAh/1.04Wh Dimension: 33.50 x 25.60 x 3.75mm Compatible Part nos: YK372731 Compatible Models: GolfBuddy Voice GPS Rangefinder, VS4 GPS Rangefinder, VS4 Voice. † SMAVCO and the SMAVCO logo are trademarks of SMAVCO LLC.