Note: Rechargeable batteries typically last 1 to 3 years. If a battery is old or depleted, it may not accept a charge, but this is not necessarily due to the charger. If you're unsure whether the battery or charger is faulty, use a voltmeter to check the charger's functionality. Connectivity technology: Powerline Input voltage: 240.0 volts_of_alternating_current Compatible phone models: iSinwheel S Series S9 S9Pro S9MAX E9 E9T 36V 7.5Ah 10.4Ah 36VDC Li-ion Battery Pack Model FY0634201500 42.0V 1.5A 42VDCBarrel Connector gender: Male-to-Female Connector type: 2-Pin Compatible devices: iSinwheel S Series S9 S9Pro S9MAX E9 E9T 36V 7.5Ah 10.4Ah 36VDC Li-ion Battery Pack Model FY0634201500 42.0V 1.5A 42VDCBarrel Special feature: High Quality 42V AC/DC Charger Replacement For iSinwheel S Series S9 S9Pro S9MAX E9 E9T 36V 7.5Ah 10.4Ah 36VDC Li-ion Battery Pack Model FY0634201500 42.0V 1.5A 42VDC Power Supply Cord PSU Barrel