AC/DC Adapter Compatible with KAYO MAXTAR MAXOAK K5 MAX Oak 82500 MAH 297Wh Capacity CPAP Battery Backup Multi-Function Power Bank Model WRP40-252300D WRP40-2523000 25.2V Supply Cord Charger - saschedross, dsf02281266

• 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. New 25.2V AC / DC Adapter Compatible with KAYO MAXTAR MAXOAK K5 K 5 MAX OAK 82500 MAH 297 Wh Capacity 82500mah/297Wh CPAP Battery Backup Multi-Function Power Bank Travel Camping Emergency Li-ion Power Banks PowerBank Model WRP40-252300D WRP40-2523000 WRP40252300D WRP402523000 +25.2V DC25.2V 25.20V 25.2 Volt 25.2 Volts 25.2VDC 25.2 V 25.2 VDC Switching Power Supply Cord Cable PS Battery Charger Mains PSU (w/ Barrel Round Plug DC IN Tip.) !!!Note: 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.