WELCH ALLYN BATTERY FOR CP100, CP200 (5200-84) (100660) (105204) Lithium Battery. Generic ECG Replacement Battery Assembly has a nominal voltage of 6.0V and a rated capacity of 6.0Ah Sealed Lead Acid (SLA). Fits Welch Allyn Models: CP100 EKG, CP200 EKG, Lifesign 4200, 5000, 5200, 52000 BP/SPO2 Quick Sign. Price per each.