18V AC/DC Adapter for Precision EasyPulse POC POC3 PM4130 POC5 PM4150 14.8V 5.2Ah Li-ion Battery REF 506760 Easy Pulse PM4100 Oxygen Concentrator 506629 ATM065-A181 Power Supply By UpBright

Low interference and noise Advanced technology and high quality High efficiency and reliability World Wide Input Voltage 100-240VAC 50/60Hz. OVP, OCP, SCP Protection (OVP: Over Voltage output Protection. OCP: Over Current output Protection. SCP: Short Circuit output Protection). Tested Units. In Great Working Condition. UpBright 30 days money back guarantee. 1 full year service warranty. Tips: Rechargeable batteries don't last forever, the average battery last 1 to 3 years. If the battery is old/dead, it will not accept a charge. But not charger's problem. If you're not sure whether battery or charger is dead or not. You must have a volt meter in order to tell whether or not a charger is working.