Capacity and Compatibility: This DIY power bank case can to 28 units of 18650 batteries, transforming them into a powerful 10W mobile power supply. It's perfect for on-the-go charging of all your USB-powered devices. Versatile Use: Featuring an integrated camping light, this battery case is perfect for outdoor activities like camping and hiking, ensuring you always have light and power in remote locations. User-Friendly Design: The case is designed with ease of assembly in mind. It includes clear markings for battery orientation and secure casing to protect your batteries from damage. Portable and : Crafted with high-quality materials, this yet sturdy case ensures durability and easy portability, making it an essential accessory for travel and emergency kits. Shipped without battery. Due to different batches, there may be differences in product appearance and printed text, which will not affect use. Colour:Black Material:ABS Package Contents: 1 * Battery Case 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.