Features: Upgraded NonSolder 4x21700 Battery Holder enables effortless assembly with weldingfree design and super fast charging, delivering high capacity power storage for devices. This durability plastic case securely houses four 21700 batteries, includes essential powerbank components, and features built in overcharge/discharge protections for stable performances. Perfect for enthusiasts, outdoor adventurers, and users seeking a customizable portable charging without soldering skills. Use it during camping trips, emergencies power outages, or daily commutes to keep smartphones, tablets, and USB C devices charging . Designed with safety circuitry and upgraded durability, this battery holder simplifies creating reliability high output powerbanks for versatile applications. Specifications: Component: Plastic Option Color: black, yellow Size:Approx.170x55.5x41.5mm/6.69x2.19x1.63inch It can assemble 4pcs 21700 lithium batteries into a portable mobile power supply to provide power for mobile phones, tablets, electronic devices, PowerBank Case only, other accessories in the picture is not included! Tips: 21700 batteries are not included in the package, you need to purchase separately. Please pay attention to the direction of the positive and negatives poles. After installing the battery, please fully charging it and activate it before outputting. Package Includes: 1pc Battery Case note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.