This product does not contain batteries. Specification: New fast dual output intelligent input control system, can put 8* 18650 battery, LCD digital display, Two-hand electric light. Feature: Size: 172*80*23mm, Maximum Power: 5V-2.1A. Package included: 1x 18650 Power Bank Case (Batteries not included). Precautions: The battery cannot be used if its outer skin is damaged, only flat batteries can be used, the voltage is in line with 3.2V-4.2V, the positive and negative poles need to be placed and used correctly, do not use or store in a high temperature environment.