{"product_id":"4x18650-diy-power-bank-case-5v-dual-usb-charging-box","title":"4×18650 DIY Power Bank Case – 5V Dual USB Charging Shell","description":"\u003cp\u003eBuild your own portable charger with this compact \u003cstrong\u003e4×18650 DIY Power Bank Shell Case\u003c\/strong\u003e. Featuring dual USB output ports and a solderless design, this kit lets hobbyists and makers assemble a fully functional mobile power bank with ease — no soldering iron required.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual USB Output:\u003c\/strong\u003e Two USB ports deliver 5V-1A and 5V-2A simultaneously, so you can charge two devices at different speeds at the same time.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMicro USB Input:\u003c\/strong\u003e Recharge the power bank itself via the Micro USB port at 5V-1A.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOne-Button Control:\u003c\/strong\u003e Single click to check battery level; press and hold 3+ seconds to toggle the built-in LED light on or off; double-click to cut output and turn off all indicators.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4-Level LED Battery Indicator:\u003c\/strong\u003e Four LED lights represent 25%, 50%, 75%, and 100% charge — always know how much power you have left.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSolderless DIY Design:\u003c\/strong\u003e No welding needed — simply insert four standard 18650 cells (not included), secure the cover, and you're done.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Plastic Shell:\u003c\/strong\u003e High-quality plastic construction is lightweight yet sturdy, with a compact footprint of 7.9 × 2.1 × 11.5 cm.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Batteries:\u003c\/strong\u003e 4 × 18650 Li-ion cells (batteries NOT included)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e USB-A 5V-1A \u0026amp; 5V-2A (dual port)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput (charging):\u003c\/strong\u003e Micro USB 5V-1A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 7.9 × 2.1 × 11.5 cm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e 1 × Power Bank Shell Case (batteries not included)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Tips\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eBefore inserting cells, inspect each 18650 battery for peeling, leakage, rust, or deformation — do not use damaged cells.\u003c\/li\u003e\n  \u003cli\u003eUse a multimeter to verify each cell is at or above 3V before installation. Deeply discharged cells may not provide adequate output.\u003c\/li\u003e\n  \u003cli\u003eAlways match positive (+) and negative (−) poles to the marked terminals inside the case. Reversed polarity can damage the circuit board.\u003c\/li\u003e\n  \u003cli\u003eFor best DIY results, use four cells with similar capacity and charge level to ensure balanced performance.\u003c\/li\u003e\n  \u003cli\u003eOnce batteries are checked and correctly installed, snap the cover closed — your DIY power bank is ready to use!\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eGreat For\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eElectronics hobbyists \u0026amp; makers\u003c\/li\u003e\n  \u003cli\u003eOutdoor adventures, camping, and travel\u003c\/li\u003e\n  \u003cli\u003eEmergency backup charging\u003c\/li\u003e\n  \u003cli\u003eDIY electronics projects and prototyping\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eYou May Also Like\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-piece-complete-gardening-tool-kit\"\u003e10-Piece Gardening Tool Kit – Iron Head \u0026amp; Plastic Handle\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-2-inch-8-piece-hex-short-socket-set-vanadium-steel\"\u003e1\/2\" Drive 8-Piece Hex Short Socket Set – Vanadium Steel\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/hex-nut-bolt-extractor-tool-kit-10-piece\"\u003e10-Pc Hex Nut \u0026amp; Bolt Extractor Kit 9–19mm | HIP Tools\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.epa.gov\/recycle\/used-lithium-ion-batteries\" target=\"_blank\" rel=\"noopener\"\u003eEPA guidance on lithium-ion battery handling\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Do the 18650 batteries come included with the DIY power bank case?\u003c\/h4\u003e\n\u003cp\u003eA: No, the four 18650 lithium-ion cells are NOT included. You will need to source compatible 18650 batteries separately. Be sure to use cells with a voltage of 3V or higher and check them for any signs of damage before installation.\u003c\/p\u003e\n\u003ch4\u003eQ: Can this power bank case charge two devices simultaneously?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The case features two USB output ports — one rated at 5V-1A and one at 5V-2A — allowing you to charge two devices at the same time with different power requirements.\u003c\/p\u003e\n\u003ch4\u003eQ: Is soldering required to assemble this DIY power bank kit?\u003c\/h4\u003e\n\u003cp\u003eA: No soldering is required. This is a fully solderless design — simply insert four 18650 batteries with correct polarity, check the indicators, and close the cover. It is ideal for makers and beginners alike.\u003c\/p\u003e\n\u003ch4\u003eQ: How do I know how much battery charge remains?\u003c\/h4\u003e\n\u003cp\u003eA: A single click of the button activates four LED indicator lights on the board, representing 25%, 50%, 75%, and 100% of total capacity, giving you a quick visual status of your remaining power.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Do the 18650 batteries come included with the DIY power bank case?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No, the four 18650 lithium-ion cells are NOT included. You will need to source compatible 18650 batteries separately. Be sure to use cells with a voltage of 3V or higher and check them for any signs of damage before installation.\"}}, {\"@type\": \"Question\", \"name\": \"Can this power bank case charge two devices simultaneously?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! 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