HQRP 2-Pack Telephone Battery for Panasonic KX-TG5230 KX-TG5240 KX-TG5243 KX-TG5428 KX-TG5480 KX-TG5561 Cordless Phone System plus Coaster HQRP&reg; 2-Pack Rechargeable Battery plus HQRP&reg; Coaster; Extra Long Standby and Talk Time; Battery Voltage: 3.6V; Capacity: 850 mAh; Ni-Mh; Keep in touch with friends and family and never miss a conversation; Compatible with Original Battery; 200 Days warranty! NiMH battery provides more talk time per shift and is less prone to memory effect