The 18650 waterproof battery box is mainly optimized on the basis of the 18650 12.6V lithium battery pack. The optimization has the following advantages: 1. This battery box has XP67 waterproof function. 2. There is no need to spot welding the battery, which greatly reduces the internal resistance of the battery, improves the battery discharge performance, and effectively improves the battery life. 3. Easy to use, using 6 18650 lithium batteries. 4. It has a DC connector input and an output voltage of 12.4V. The USB connector has an output voltage of 5V and a current of 2A, which can charge the phone. (The voltage of battery input and output has an error of 0.2V) 5. With power display function. (3LED indicator light) Technical parameters of multi-function battery box 1. Input voltage: 12.6V 2. Overcharge protection voltage: 12.6V 3. Over-discharge protection voltage: 8.4V 4. Over-discharge protection current: 9v 5. Standby current: 100ua 6. USB output standard voltage: 5V0.2V 7. USB maximum output: 2000ma Instructions for use: 1. The battery box is suitable for 2.5-4.2V 18650 lithium rechargeable batteries ( use batteries with the same capacity and the same model) 2. Connect the output port of the 12.6V charger to the round DC port of the battery box for charging 3. The DC circular port of the battery box is 12.6V, which can be output or input. The 5V USB port is only used for output and can be connected to digital products, such as mobile phones and 4. The USB output can reach 2000mA, which greatly shortens the charging time. 5. Waterproof rating: IP67 Two interfaces, 12.4v can output input, 5v output, can be put into 18650 as a charger, can be used as a portable battery box, power supply for bicycle lights, USB lights, 12v LED lights and soon. colour:black Material:ABS size:11.5X8X5.7cm Package Contents: 1 x 12V Battery Case Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.