Features 1、1. This battery box features XP7 waterproof function. Two interfaces, 16v can be input and output, 5v output, can be put into 18650/26650 as a charger, can be used as a portable battery box, charger, power supply for bicycle lights, USB lights. 2、2. There is no need to spot weld the battery, which greatly reduces the internal resistance of the battery, improves the discharge performance of the battery, and effectively improves the battery life. 3、3. Easy to use, use 4 pcs 18650/26650 lithium batteries. 4、4. With DC connector input and output voltage 16V. The output voltage of the USB connector is 5V and the current is 2A, and it has the function of charging the mobile phone. (The voltage of battery input and output has an error of ±0.2V) 5、5. With power display function. (3LED display lights) Specification Material: plastic Net weight: about 220g Gross weight: about 260g Size: about 95X64X64mm Battery specification: 18650*4/26650*4 Package List 1 * Battery Box