Features: brand new and high quality Using quality plastic, strong and durable, it is a necessary tool for DIY power banks. Can install 12pieces 18650 batteries. Output maximum power:5V-3A/9V-2A/12V-1.5A/4.5V-5A/5V-4.5A The battery cannot be used if the battery is damaged. The internal resistance will increase after the battery is used for a long for time,if the internal resistance is too high,it will affect the motherboard's normal boost and high-power output load current limit. Package Includes: 1x Power Bank DIY for Case Specifications: Material:Plastic Size:Approx.15.3x8x4.3cm/6.02x3.15x1.69in Color:Black,White Net Weight:160g note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.