{"product_id":"21700-power-bank-kit-usb-c","title":"DIY 21700 Power Bank Kit – Dual USB + USB-C + Optional Wireless Charging (No Cells)","description":"\u003cdiv style=\"font-family: Arial, sans-serif; line-height: 1.6;\"\u003e\n\u003ch2\u003eDIY 21700 Power Bank Kit (No Cells Included)\u003c\/h2\u003e\n\u003cp\u003eBuild your own high-performance portable power bank using this versatile DIY kit. Designed for makers, hobbyists, and tech enthusiasts who prefer full control over battery quality and performance.\u003c\/p\u003e\n\u003ch3\u003e🔋 Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHolds \u003cstrong\u003e4× 21700 Li-ion cells\u003c\/strong\u003e (not included)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual USB-A\u003c\/strong\u003e output ports + \u003cstrong\u003eUSB-C\u003c\/strong\u003e input\/output\u003c\/li\u003e\n\u003cli\u003eOptional \u003cstrong\u003eQi Wireless Charging (10 W)\u003c\/strong\u003e on premium model\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBMS protection\u003c\/strong\u003e: over-charge, over-discharge, and short-circuit safety\u003c\/li\u003e\n\u003cli\u003eBuilt-in \u003cstrong\u003eLED flashlight\u003c\/strong\u003e and battery-level indicators\u003c\/li\u003e\n\u003cli\u003eDurable \u003cstrong\u003eABS plastic enclosure\u003c\/strong\u003e with copper-accent trim\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e⚙️ Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInputs:\u003c\/strong\u003e Micro-USB, Type-C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutputs:\u003c\/strong\u003e 2× USB-A + Type-C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWireless Charging:\u003c\/strong\u003e 10 W (optional model only)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Cells:\u003c\/strong\u003e 21700 Li-ion (flat-top preferred)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.50 lb (0.23 kg)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e🧰 What's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1× Power bank housing with pre-installed BMS and ports\u003c\/li\u003e\n\u003cli\u003e1× Screw set for assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size: 12px; color: #555;\"\u003eSmall note: cells and wires are not included. You can find compatible 21700 cells on RenewSpark.\u003c\/p\u003e\n\u003cp style=\"font-size: 12px; color: #555;\"\u003e—  \u003cbr\u003eDownload “RenewSpark Tools” on the iOS App Store — the toolbox I use for battery building.\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"RenewSpark","offers":[{"title":"Dual USB + USB-C (No Cells)","offer_id":47244610928867,"sku":"PB110","price":16.99,"currency_code":"USD","in_stock":true},{"title":"Dual USB + USB-C + Wireless","offer_id":47244610961635,"sku":"PB111","price":20.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/7594\/8771\/files\/25-000mah-high-capacity-power-bank-dual-usb-wireless-charging-removable-21700-cells-196.png?v=1760745896","url":"https:\/\/renewspark.com\/products\/21700-power-bank-kit-usb-c","provider":"RenewSpark","version":"1.0","type":"link"}