Transform your collection of 18650 batteries into a powerful, no need welding power sources with this innovative DIY Power Case featuring QC3.0 and PD technology for rapid charging. The case detachable design and digital display offer convenience and ease of use, while its compatibility for flat head 18650 batteries ensures a customizable charging solution. Suitable for enthusiasts and frequent travelers, this case caters to those who demand reliable power for their multiple devices on the go. Power Case only, other accessories in the picture is not included! Tip: 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. Please pay attention to the direction of the positive and negative poles. Number of batteries: 40x18650 batteries Specifications:A:C40 C40 Case Output:5V2.10A C40 Case Input:5V2.10A Support Fast Charging Protocols:QC2.0,BC1.2 Note: Installation guide not included, we strongly recommend you seek professional installation. Please check as much as possible to make sure the item is what you need. Tips:The product may be updated constantly,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use. Colour:Black Material:Plastic Package Contents: 1 * Battery 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.