Logitech AHB521630 Cordless Phone Battery (Li-Pol 3.7V 240 mAh) - Replacement for Logitech 533-000071 Cordless Phone Battery (Li-Pol 3.7V 240 mAh) Replacement For Logitech 533-000071 Cordless Phone Battery Made with high quality Japanese cells. 100% compatible with your OEM battery. 1 year warranty