Plantronics W740M Cordless Phone Battery CPP-547 3.7V Li-Pol 140mAh - Replacement For Plantronics 82742-01 Cordless Phone Battery Replacement Battery for Plantronics 82742-01 -84598-01 Li-Pol, 3.7 Volt, 140 mAh. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark