25.2V 2-Prong AC DC Adapter Replacement for Seauto Seal SE SealSE 21.9V 7800mAh Li-ion Battery SAT-3P6S Cordless Robotic Pool Vacuum Automatic Spa Cleaner Power Supply Charger 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.