LENMAR Replacement Battery for Plantronics Savi WH500, W440, W740 & W745 - Bluetooth Wireless Headset- Retail Packaging- Black Fits: Plantronics Savi WH500,W440,W740, W745 Replaces: Plantronics 84598-01 3.7V / 140mAh Lithium Polymer 1 Year Warranty