(Note: !!! 25.9V is Vacuum's battery voltage. !!! NOT charger's voltage. ) New Global 30V AC / DC Adapter Compatible with Ultenic U10 Pro U10Pro 25.9V 2200mAh DC25.9V 2.2Ah 25.9 Volt 2200 mAh 25.9 Volts 2.2 Ah 25.9VDC Lithium ion Li-ion Liion Rechargeable Battery Pack 400W 30KPa Powerful Suction Ultra-Lightweight Cordless Stick Vacuum Cleaner +30V 0.5A DC30V 500mA 30.0V 0.50A 30VDC 30.0VDC 30 V 30.0 VDC Class 2 Switching Power Supply Cord Cable PS Wall Home Charger Mains PSU Compatible with: Ultenic U10 Ultra U10Ultra 25.9V 2200mAh Lithium ion Li-ion Liion Rechargeable Battery Pack 450W 30KPa Powerful Suction Cordless Stick Vacuum Cleaner !!!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. Compatible with listing item ASIN: B0CYZ3Q3HJ -- Ultenic U10 Ultra Cordless Stick Vacuum Cleaner, 450W Motor, 30KPa Suction, Long Battery Life, Anti-Tangle Brush, 1L Dustbin Capacity, Stick Vacuum for Home, Pet Hair, Hardwood Floors, and Carpets Onerbl AC adapters are manufactured with the highest quality materials tested and designed to meet the power needs of your device. This power supply allows you to operate your device or charge its battery from electrical power outlets.This adapter converts AC power into the DC power required by your device. Onerbl adapters are great solution during travel.This adapter has been validated and tested to ensure it will work with your device.