Features: This for 12 cell 18650 battery enxlosure box delivers high capacity fast charging for devices like smartphones and tablets, featuring a solderless design with spring contacts for safe, easy assembly. Equipped with spring loaded connectors and multiple protections circuits, the case prevents overcharging/over discharging while enabling expansions with compatible battery case. Ideal for enthusiasts and users customizable portable power solution without welding expertise or specializing tools. Perfect for outdoor, emergency backups, or daily commutes, its lightweight slip proof housing ensures reliabled charging during travel or power outages. Optimizes your devices running time with this expandable battery pack kit,for easy cell replacement and future capacity upgrades using standard 18650 flat top cells. Specifications: Material: ABS Color: black, white Support: 2 way fast charging Super fast charging: 22.5W Applicable battery model: 18650 flat top battery Case Size about 153x80x45mm/6.02x3.15x1.77in Package Includes: 1PC Battery Case note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution