HQRP Battery for ATT BT191665 TL7700 TL7800 TL7810 TL7812 TL7910 TL7912 Cordless Headset Plantronics SB3014-WM Wireless Mic + HQRP Coaster HQRP&reg; Replacement Rechargeable Battery plus HQRP&reg; Coaster; Battery Voltage: 3.7 Volt; Capacity: 240 mAh; Li-Pol; 200 Days warranty!