{"product_id":"3-18650-battery-charger-case-diy-power-bank-box-fast-charge-5v-2a-double-usb-output-battery-storage-box-with-led-night-light","title":"3x18650 DIY Power Bank Case — Dual USB Fast Charge with LED Night Light","description":"\u003ch2\u003eBuild Your Own Power Bank.\u003c\/h2\u003e\u003cp\u003eThis 3x18650 battery charger case lets you build a custom power bank using standard 18650 lithium cells — the same cells used in laptops, flashlights, and power tools. Load it with three 18650 batteries and you have a portable dual-USB charger that you can refill with fresh cells when they wear out, rather than replacing the entire unit. The built-in LED night light adds a practical bonus for bedside or camping use.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3x18650 cell capacity\u003c\/strong\u003e — holds three standard 18650 lithium cells; total capacity depends on the cells used (typically 6000–12000mAh with quality cells)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual USB-A output at 5V\/2A\u003c\/strong\u003e — fast charges two devices simultaneously from the installed cells\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLED night light\u003c\/strong\u003e — built-in LED provides soft ambient light for bedside, camping, or emergency use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaceable cells\u003c\/strong\u003e — when cells wear out, replace them individually rather than discarding the entire unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact shell\u003c\/strong\u003e — lightweight housing keeps cells organized and protected\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide cell compatibility\u003c\/strong\u003e — fits standard 18650 cells (check variant for flat top vs. button top compatibility)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWho It’s For\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDIY electronics enthusiasts who want to build a custom power bank\u003c\/li\u003e\n\u003cli\u003eFlashlight hobbyists who already stock 18650 cells and want a dual-purpose charger\/power bank\u003c\/li\u003e\n\u003cli\u003eCampers who want a power bank with a built-in night light\u003c\/li\u003e\n\u003cli\u003eAnyone who wants a long-term, sustainable portable charging solution with replaceable cells\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003col\u003e\n\u003cli\u003eInsert three fully charged 18650 cells into the case, observing correct polarity (+ and − markings).\u003c\/li\u003e\n\u003cli\u003eClose the case and connect devices to the dual USB-A output ports.\u003c\/li\u003e\n\u003cli\u003ePress the LED button to activate the night light function.\u003c\/li\u003e\n\u003cli\u003eWhen cells are depleted, remove and recharge using a dedicated 18650 charger, then reinstall.\u003c\/li\u003e\n\u003c\/ol\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAre 18650 cells included?\u003c\/strong\u003e\u003cbr\u003eNo — 18650 cells are not included. Purchase quality cells from reputable brands (Samsung, LG, Panasonic, Sony) for best performance and safety. Avoid unbranded cells with inflated capacity claims.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I charge the cells while they’re in the case?\u003c\/strong\u003e\u003cbr\u003eThis case requires removing cells for charging in a dedicated 18650 charger — it does not have a USB input for in-case charging. Check the variant details to confirm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat capacity will I get?\u003c\/strong\u003e\u003cbr\u003eThree 3000mAh 18650 cells provide approximately 9000mAh at 3.7V, which translates to roughly 5000–6000mAh of usable output at 5V USB after conversion losses.\u003c\/p\u003e","brand":"Authority Asset Brand","offers":[{"title":"black","offer_id":48361214836980,"sku":"14:193","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0823\/0564\/6836\/files\/Sec4a7e050dd247d8a8e0d6eafe4df5ce3.webp?v=1780173888","url":"https:\/\/authorityassetbrand.com\/products\/3-18650-battery-charger-case-diy-power-bank-box-fast-charge-5v-2a-double-usb-output-battery-storage-box-with-led-night-light","provider":"Authority Asset Brand","version":"1.0","type":"link"}