(⚠️Note: 36V 2Ah is the lithium-ion battery Capacity of the built-in device. This item is NOT for 36V or 42V 2A ❌ charger. ⚠️w/ Barrel ✅ Round Plug. NOT 3-Prong ❌ Connector. Someone may have bought it by mistake. Please Check For Compatibility With Your Unit. Thanks.) eeTao 42V AC / DC Adapter Charger Compatible with Model: JY-T3 JYT3 36V 2.0Ah DC36V 2Ah 36 Volt 36 Volts 36VDC Lithium Ion Li-ion Battery +42V 400mA DC42V 0.4A 42.0V 0.40A 42VDC 42.0VDC 42 V 42 VDC Switching Power Supply Cord Cable PS Charger Mains PSU (⚠️w/ Barrel ✅ Round Plug Tip single prong. NOT 3-Prong ❌ Connector. Please Check For Compatibility With Your Unit. Thanks.) ⚠️!!!Note: 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. eeTao 42V AC / DC Adapter Charger Compatible with Model: JY-T3 JYT3 36V 2.0Ah DC36V 2Ah 36 Volt 36 Volts 36VDC Lithium Ion Li-ion Battery +42V 400mA DC42V 0.4A 42.0V 0.40A 42VDC 42.0VDC 42 V 42 VDC Switching Power Supply Cord Cable PS Charger Mains PSU (⚠️w/ Barrel ✅ Round Plug Tip single prong. NOT 3-Prong ❌ Connector. Please Check For Compatibility With Your Unit. Thanks.) CECCCROHS 100-240