1. Please note that 18650 batteries are required for operation but are not included with this package. You need to purchase these separately, ensuring they have a flat top positive electrode for compatibility. 2. This power bank case is specifically designed to use only 18650 batteries with flat top positive electrodes. your batteries meet these specifications to maintain efficiency and in charging. 3. Experience seamless device operation with our detachable battery case, which features advanced quick wireless charging and a clear LCD display for monitoring power levels and charging status. 4. Our DIY power bank kit promotes easy battery maintenance and replacement with a user-friendly design that requires no welding. It's an ideal choice for tech enthusiasts looking for a customizable power solution. 5. Ideal for anyone needing reliable power on-the-go, this versatile storage box is designed to cater to a wide range of users, from tech enthusiasts to outdoor adventurers, providing power in various situations without hassle. Shipped without battery. Current up to 5A, efficiency up to 96% Support JEITA specification, support temperature loop control Output power up to 22.5W, efficiency up to 95% Output fast charging protocol: support /PD3.0/PD2.0, support QC4+/QC4/QC3.0/QC2.0, support AFC support FCP, support SCP, support PE2.0/PE1.1, support SFCP, support low voltage direct charging Input fast charging protocol: support PD3.0/PD2.0, support AFC, support FCP Due to different batches, the product appearance and printed text , but it not affect the use. Colour:Black Material:Plastic 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.