This product is a component without a battery core. It is used to repair and assemble batteries, only for people who are familiar with battery performance and have practical experience in battery assembly. It can fill 10 pieces of 18650 Li-ion batteries. Note that this is a plastic shell, there is no battery inside. Type: Battery Storage Box Model Number: Color: Black+Yellow Material: Plastic Package Contents: 5 x Battery Box (with accessories) 5 x PCB Board (The color is random and the specified color cannot be selected) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.