Brand new PD 4410 Sealed Lead Acid (SLA) rechargeable battery for use with ZOLL AED PRO, M Series Defibrillator, and E Series Defibrillator. 1400/2000/1600/1700/M Series/AED Pro Sealed Lead/Acid (SLA) Battery (not upgradeable to Smart Battery) formerly 8004-0009. 8050-0022-01 Charger not included. - Rechargeable Sealed Lead Acid (SLA) Battery Features:Operating life: 115 charging cycles - Shelf Life: 1.5 years from manufacture date - Recommended to have back up battery charged at all times - Zoll E Series1400160017002000.