(Note: !!! 21.9V is Pool Cleaner's battery voltage. !!! NOT charger's voltage. Please Check For Compatibility With Your Unit. Thanks.) Tested Units. In Great Working Condition. UpBright 30 days Refund. 24 Months Exchange UpBright New Global 2-Prong 26V AC / DC Adapter Compatible with Seauto Model Crab CR CA New Seal PC09 PCO9 21.9V 7800mAh 170.82Wh DC21.9V 7.8Ah 21.9 Volt 7800 mAh 21.9 Volts 7.8 Ah 21.9VDC Lithium ion Li-ion Liion Rechargeable Battery Pack Smart Cordless Robotic Swimming Vacuum Wall-Climbing Automatic Pool Spa Cleaner DC26V 2.6A 67.6W 26.0V 2.60A 67.60W 26VDC 2600mA 26.0VDC 2600 mA 26 V 26.0 VDC Class 2 Switching Power Supply Cord Cable PS Charger Mains PSU (w/ 2-pin Connector) Compatible with: Model No.: SAT65A-2602600 SAT65A2602600 26V 2.6A 67.6W 26.0V 2.60A 67.60W DC26V 2600mA 26 Volt 26 Volts 26VDC 2600 mA 26.0VDC 26 V 26.0 VDC Power Supply 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) !!!Note: Rechargeable batteries don't last forever, the average battery last 1 to 3 years. If the battery is old/bad, it will not accept a charge. But not charger's problem Compatible with listing item -- (2024 New) Compatible with Seauto Seal Robotic Pool Vacuum, Wall-Climbing, Automatic Pool Cleaner, Suitable for Walls and Floors of 1614 Square Feet Pool / -- Crab Robotic Pool Vacuum, Wall-Climbing Robot, Automatic Pool Cleaner, Suitable for Walls and Floors of 1614 Square Feet Pool (Black) Compatible with listing item -- (2024 New) Crab Cordless Robotic Pool Cleaner，Wall-Climbing， Automatic Pool Cleaner，Pool Vacuum for Inground Pools / -- Seauto Crab Robotic Pool Cleaner climbs Walls, autonomously Cleaning Pools up to 1640 Square feet, Ideal for Both Walls and Floors UpBright New Global 2-Prong 26V AC / DC Adapter Compatible with Seauto Model Crab CR CA New Seal PC09 PCO9 21.9V 7800mAh 170.82Wh DC21.9V 7.8Ah 21.9 Volt 7800 mAh 21.9 Volts 7.8 Ah 21.9VDC Lithium ion Li-ion Liion Rechargeable Battery Pack Smart Cordless Robotic Swimming Vacuum Wall-Climbing Automatic Pool Spa Cleaner DC26V 2.6A 67.6W 26.0V 2.60A 67.60W 26 Volt 2.6 A 26 Volts 2600 mA 26VDC 2600mA 26.0VDC 26 V 26.0 VDC Class 2 Switching Power Supply Cord Cable PS Charger Mains PSU (w/ 2-pin Connector)CECCCROHS 100-240