General description This product is a plastic case shell designed for assembling and repairing batteries. It is specifically intended for individuals who are knowledgeable about battery performance and have practical experience in battery assembly. The case can accommodate up to 10 pieces of 18650 Li-ion batteries. Please note that this is a plastic shell and does not include a battery core. Technical specifications Type: Battery Storage Box Model Number: Not specified Color: Black+Yellow Material: Plastic Package Contents: 5 x Battery Box (with accessories), 5 x PCB Board (color is random) Measurement allowed error: +/- 1-3 cm