Use and maintenance of the charger: 1. When charging, connect to the battery first, then plug into the AC outlet. After charging is complete, disconnect from the AC outlet first, then unplug the battery connector. Unplugging the battery connector during charging, especially when the charging current is high (red light illuminated), may damage the charger. 2. When the LED light turns green, continue charging for an additional 2–3 hours. 3. Avoid fully discharging the battery before recharging. Doing so may reduce battery protection and potentially cause damage. 4. For long-term shallow discharge usage, perform a deep discharge approximately every 3 months. This process, known as reconditioning, helps activate inactive materials within the battery. Deep discharge is indicated by the controller’s low-voltage protection activation during use. 5. Use the charger in a dry environment. 6. When not in use, disconnect the charger from the power source. 7. Confirm compatibility with your battery. This charger is designed for lithium-ion batteries. Do not use with LiFePO4 batteries, as this may cause the charger to overheat. Plug Type: EU Plug, compatible with countries including Germany, France, Spain, Italy, and Indonesia. Compatible with Ninebot ES1 and ES2 scooters. 100% with strong protection features. Input: 100–240V AC, 50/60Hz Output: 42V 2A Charge indicator: Red light during charging, green when fully charged Safety protections: Overvoltage protection (OVP), Overcurrent protection (OCP), Overload protection, Short-circuit protection Material: Plastic Color: Black Package Contents: 1 x Charger Note: Lighting and display differences may result in slight color variations between the product image and actual item. Measurement tolerance: ±1–3 cm.