Use and maintenance of the charger: 1. When charging, first connect to the battery, then connect to AC power; after full charge, disconnect from AC power, then remove the battery plug. Removing the battery plug during charging, especially when the charging current is high (red light), may damage the charger. 2. When the LED light turns green, continue charging for 2-3 hours. 3. Do not fully discharge the battery before charging. Doing so may prevent charging or damage the battery. 4. For long-term shallow discharge use, perform a deep discharge approximately every 3 months. This helps activate the battery components that have been inactive for a long period. Deep discharge refers to the controller's battery low-voltage protection activation. 5. Use the charger in a dry location. 6. When not in use, disconnect the charger from the power supply. 7. Confirm compatibility with your battery. This charger is designed for lithium batteries. Do not use it with LiFePO4 batteries, as this may cause the charger to overheat. High-quality construction with strong protection features. Output: 42V 1.5-2A Color: Black Material: Plastic Plug Type: EU Plug, suitable for countries using EU standard outlets Input Voltage: AC 100-240V Package Contents: 1 x Charger 1 x Plug Only the above items are included; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error is permitted within +/- 1-3 cm.