{"product_id":"12x21700-diy-power-bank-case-fast-wireless-charging-dual-usb-c","title":"12×21700 DIY Power Bank Case – 22.5W Fast \u0026 15W Wireless Charging","description":"\u003ch2\u003eBuild Your Own High-Capacity Power Bank\u003c\/h2\u003e\n\u003cp\u003eTake full control of your portable charging setup with this \u003cstrong\u003e12×21700 DIY Power Bank Shell\u003c\/strong\u003e. Designed for makers, tech enthusiasts, and anyone who wants a customizable charging solution, this case supports up to 12 standard 21700 cells (not included) and delivers impressive wired and wireless charging speeds — all in a sturdy plastic-and-metal housing.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're topping up a smartphone fast or charging a device wirelessly overnight, this box has you covered with multiple output modes and a built-in LED indicator so you always know your charge status at a glance.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFits 12 × 21700 Cells\u003c\/strong\u003e — High-capacity DIY configuration for extended use (batteries sold separately)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e22.5W Wired Fast Charging\u003c\/strong\u003e — Rapid charge compatible devices via the dual USB \/ USB-C ports\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e10W \u0026amp; 15W Wireless Charging\u003c\/strong\u003e — Built-in Qi wireless charging pad for cord-free convenience\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual USB + USB-C Output\u003c\/strong\u003e — Charge two or more devices simultaneously\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLED Charge Indicator\u003c\/strong\u003e — Instantly see remaining battery level without guessing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Plastic + Metal Construction\u003c\/strong\u003e — Lightweight yet resilient housing that protects your cells\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAvailable in Black \u0026amp; White\u003c\/strong\u003e — Clean, minimal aesthetic to suit any style\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCell Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12 × 21700 (batteries not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Output Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≤37.5W\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWired Fast Charging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10W \/ 22.5W\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWireless Charging\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15W (Qi)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePorts\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDual USB-A + USB-C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic + Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e164 × 85 × 52 mm (6.45 × 3.34 × 2.04 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColors\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack \/ White\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 12-Cell 21700 DIY Power Bank Case\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: 21700 batteries are NOT included. Please allow ±5–10 mm for manual measurements. Colors may vary slightly due to monitor settings.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/3-mode-dimmable-led-night-light-wall-socket-remote-control\"\u003e3-Mode Dimmable LED Night Light Wall Socket with Remote\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/e27-multi-head-lamp-base-holder-socket-adapter-ceiling-light\"\u003e2-Pack E27 Multi-Head Lamp Socket Adapter 3\/4\/5 Head Ceiling\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/nitrile-work-gloves-anti-slip-full-finger-5-pair\"\u003e5-Pair Nitrile Work Gloves – Anti-Slip Full Finger Safety\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.energystar.gov\/products\" target=\"_blank\" rel=\"noopener\"\u003eENERGY STAR product efficiency guidance\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What size batteries does this DIY power bank case support?\u003c\/h4\u003e\n\u003cp\u003eA: This case is designed specifically for \u003cstrong\u003e21700 lithium cells\u003c\/strong\u003e and holds up to 12 of them. 21700 batteries are NOT included and must be purchased separately. Make sure to use quality 21700 cells for best performance and safety.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What charging speeds does this case support?\u003c\/h4\u003e\n\u003cp\u003eA: The case supports \u003cstrong\u003e10W and 22.5W wired fast charging\u003c\/strong\u003e via its Dual USB and USB-C ports, and \u003cstrong\u003e15W Qi wireless charging\u003c\/strong\u003e for compatible devices. Maximum combined output power is ≤37.5W.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I charge multiple devices at the same time?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The dual USB-A and USB-C output ports allow you to charge more than one device simultaneously, making it ideal for topping up a phone and earbuds or tablet at the same time.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does the LED indicator show how much charge is left?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. The built-in LED indicator lights up to display the current battery level, so you can monitor your stored charge at any time without needing an app or display screen.\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\": \"What size batteries does this DIY power bank case support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This case is designed specifically for 21700 lithium cells and holds up to 12 of them. 21700 batteries are NOT included and must be purchased separately. 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