1. The 21x18650 Battery Storage Box is a must have for DIY enthusiasts, allowing you to with ease. 2. This storage box with bright light features quick charge, ensuring fast and efficient charging for your devices. 3. Designed for all users, this battery holder box is compatible for 18650 flat top batteries, providing a reliable and convenient power solution for everyone. 4. Whether you're traveling, working, this case is perfect for any situation where you need a portable and reliable power source. 5. 18650 batteries are not included in the package, you need to purchase separately. Can only use the 18650 battery of which positive electrode is flat top. Specifications: Number of batteries: 21x18650 batteries Colour:black Material:plastic style: D21-PD Due to different product batches, the appearance , which does not affect the use Package Contents: 1 x 21 * 18650 powerbank case (Battery not include) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.