VXI Blue Parrott Wireless Headset Battery (LI-POL 3.7V 250mAh) - Replacement for VXI BT250-XT+ BT900 HS393 Wireless Headset Battery Li-Pol 3.7V 250mAh Replacement For VXI BT250-XT+ BT900 HS393 Wireless Headset Battery Made with high quality Japanese cells. 100% compatible with your OEM battery. 1 year warranty