The 18650 waterproof battery box is optimized from the traditional 18650 12.6V lithium battery pack with the following improvements: 1. This battery box features IP67 waterproof rating. 2. No spot welding required for the batteries, which helps reduce internal resistance, improve discharge performance, and extend battery life. 3. Easy to use with 6 18650 lithium batteries. 4. Equipped with a DC connector for input and output at 12.4V. The USB connector provides 5V output with 2A current, suitable for charging phones. (Input and output voltage may vary by +/-0.2V) 5. Includes power level indication with 3 LED indicator lights. Technical specifications: 1. Input voltage: 12.6V 2. Overcharge protection voltage: 12.6V 3. Over-discharge protection voltage: 8.4V 4. Over-discharge protection current: 9A 5. Standby current: 100A 6. USB output voltage: 5V +/-0.2V 7. USB maximum output current: 2000mA Usage instructions: 1. Compatible with 2.5-4.2V 18650 lithium-ion rechargeable batteries (use batteries of the same capacity and model). 2. Connect the 12.6V charger output to the round DC port of the battery box for charging. 3. The DC port supports 12.6V input and output. The 5V USB port is output only and can power digital devices such as mobile phones. 4. USB output supports up to 2000mA, helping reduce charging time. 5. Waterproof rating: IP67 Features two ports: 12.4V port for input/output, and 5V USB port for output. Can be used as a battery holder, portable power source, or for powering devices such as bicycle lights, USB lights, and 12V LED lights. Color: Black Material: ABS Size: 11.5 x 8 x 5.7 cm Package Contents: 1 x 12V Battery Case Note: Light and display settings may cause slight color differences between the image and the actual item. Measurement may vary by +/-1-3 cm.