Feature: 1. Intelligent Control: The auto battery charger features a multifunctional design that can charge various voltage batteries, providing convenience and time savings. 2. Universal Compatibility: Suitable for all vehicle battery types, this charger is designed for wide range use, ensuring longer battery life and effortless operation. 3. Powerful Guard: Equipped with safety features such as overcharge, over discharge, and overload guards, the charger ensures safe and reliable operation without damaging the battery. 4. Start Stop Function: Automotive battery maintainer extends the life of the battery with the start stop function, allowing for efficient and effective usage over time. 5. Efficient Charging: With a peak power of 220W and various charging modes for different battery types, this versatile charger offers quick and reliable charging for optimal performance. Specification: Item Type: Car Battery Charger Material: Iron, Electronic Circuit Board U.S. Three Plug: 110-250V Output Voltage: 12V: 14V±0.3 24V: 28V±0.3 Peak Current: 12V: 10A 24V: 7.5A Normal Mode: Can charge 12V, 24V batteries and SLA batteries (Wet, MF, gel, VRLA and flooded), SLA batteries (Wet, MF, gel, VRLA and flooded), SLA batteries (Wet, MF, gel, VRLA and flooded), SLA batteries (Wet, MF, gel, VRLA and flooded). Li ion Mode: 12.6V, 25.2V charging Start Stop Mode: Charge AGM, EFB, Li-FePO4 Batteries Measured Power: 220W Power Cord Length: Approx. 110cm or 43.3in Clip Line Length: Approx. 60cm or 23.6in Wiring: Red Clamp Clips Power Positive, Black Clamp Clips Power Negative Guard Measures: Short Circuit Guard Polarity Error Guard Overheating Guard Over Current Guard Low Voltage Guard Over Voltage Guard Connect the charger to the AC power supply, the charger starts to work (the charging indicator starts to flash in color) 1. How to know the battery is fully charged Current drops to below 0.3A (or 0.5A) Charging indicator light is off Note: For normal batteries, if abnormal, refer to the first item 2. How to use maintenance (repair) mode First, select the appropriate battery type. Then, press the maintenance button. It will start working. After maintenance is complete (takes about 1 hour), it will automatically switch to smart charging. It will stop when full. Common issues: 1. Charger shows battery is fully charged, but battery is not actually full. Reason: Due to high internal resistance of the battery or reduced battery capacity, for depleted batteries, sulfated batteries, or batteries with low voltage, long idle time. Battery voltage will immediately soar, causing the battery to show 100 percent state without being completely charged. Solution: Charge in maintenance mode, it will stop automatically when full. (Stop charging immediately if the battery heats up!) 2. Battery voltage is normal, but the charger is not working. Reason: No AC power input. Solution: Check if AC power is normal, try again after changing the socket. 3. Unable to fully charge after long charging. Reason: Battery is sulfated, or feeder, or internal water in the battery is depleted. Battery voltage will remain low, causing the battery to be unable to fully charge. 4. Why the 12V battery can be charged but not the 24V battery Because the combined voltage of the two batteries can't reach more than 18V, so it can't recognize 24V. We can charge them for a period of time at a time(half hour‑1 hour), then connect them together to charge. Note: A: The above charging data is the actual reference for normal battery charging. For sulfurized batteries, internal resistance batteries and residual power batteries, the above charging time is not a reference. B: When we charge small batteries (capacity less than 20AH), or scrap, leakage, or when charging for the first time, we need to pay attention to the fact that when the battery case becomes hot, please stop charging!. Package List: 1 x Charger 1 x User Manual