Features: 18650 size 0V virtual battery connector tube, short-circuit design, can only be used in series, not in parallel. 18650 battery connector housing, 0V used as a conduction conductor, without charging function, battery elimination accessory, positive and negatived electrode connection design. Not a real 18650 battery, without real power, designed with positive and negatived short circuits, mainly used in series with other 18650 batteries. Cannot be charged, can be used in series with a real 18650 battery(not include), be careful not to use in parallel. Flat end 18650 virtual battery placeholder, which can be used for training new employees in welding skills in electronic factories. Specifications: Name: 18650 battery placeholder 0V false battery conduction short circuit design Color: green, red, blue, yellow Height: about 65mm/2.56inch Diameter: about 18mm/0.71inch Quantity: 2 pieces Package Includes: 2Pcs 18650 Battery Placeholder Virtual Battery Setup Shell note: Can only be used in series and can use for factory employees practice welding batteries. Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.