4-Pin DIN 54.4V AC/DC Adapter for Mean Well Model GC120A48-R7B GC120A48R7B GC120A48-AD1 GC120A48AD1 MW DC54.4V 2.21A 120.2W 54.4VDC 4-Prong Power Supply Cord Battery Charger PSU 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.