{"product_id":"dc-12v-output-3x-18650-battery-ups-diy-power-bank-box-for-router-cellphone-tablet-modem-cctv-camera-1","title":"DC 12V DIY UPS Battery Box — 3×18650 Cells, 24W, True 0ms Switchover (No Battery)","description":"\u003cp\u003eBuild your own uninterruptible power supply with this compact 12V UPS battery box. Designed for electronics enthusiasts and DIY builders, it delivers true 0ms seamless switching — meaning your router, modem, CCTV camera, or fish tank pump stays on without a single blip when the power cuts out.\u003c\/p\u003e\u003cp\u003e\u003cem\u003e⚠️ Batteries not included. Requires 3×3.7V flat 18650 cells (user-provided).\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eWhy It Stands Out\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrue 0ms switchover\u003c\/strong\u003e — No interruption, no restart. This is a genuine UPS, not a delayed backup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo special charger needed\u003c\/strong\u003e — Built-in 0.4A constant current circuit charges from any standard 12–13V switching power supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e97.3% efficiency\u003c\/strong\u003e — Direct 3-cell series output minimizes energy loss. Efficiency approaches 100% at higher battery voltages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCharging status indicator\u003c\/strong\u003e — Red light while charging, off when full. Simple and intuitive.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull protection suite\u003c\/strong\u003e — Overcharge (4.25V×3), low voltage (2.75V×3), and overcurrent protection built in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide temperature range\u003c\/strong\u003e — Operates from -20°C to 60°C.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatible With\u003c\/h2\u003e\u003cp\u003eWiFi routers · Fiber modems · CCTV cameras · Fish tank pumps · Monitoring systems · Tablets · Smartphones · Any 12V DC device drawing up to 2A\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eOutput:\u003c\/strong\u003e DC 12V \/ 2A (24W max)\u003cbr\u003e\u003cstrong\u003eOutput Voltage Range:\u003c\/strong\u003e 8V (low protection) – 12.6V (full charge) — unregulated, varies with battery level\u003cbr\u003e\u003cstrong\u003eBattery:\u003c\/strong\u003e 3×3.7V flat 18650 (not included) — ~37Wh at 3400mAh\u003cbr\u003e\u003cstrong\u003eCharger Input:\u003c\/strong\u003e 12–13V (12.7V recommended) \/ 0.4A\u003cbr\u003e\u003cstrong\u003eCharging Power:\u003c\/strong\u003e ~4.8W (input must exceed load + 5W)\u003cbr\u003e\u003cstrong\u003eSwitchover Time:\u003c\/strong\u003e 0ms\u003cbr\u003e\u003cstrong\u003eDC Port:\u003c\/strong\u003e DC 5.5×2.1mm (center positive)\u003cbr\u003e\u003cstrong\u003eOperating Temp:\u003c\/strong\u003e -20°C to 60°C\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e⚠️ Note:\u003c\/strong\u003e Do not perform short-circuit protection tests on this board — it may damage the diode. Short-circuit protection only activates after the diode has been triggered.\u003c\/p\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e1× UPS battery box\u003c\/li\u003e\n\u003cli\u003e1× Wire\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"*The Jaksonia shop* ","offers":[{"title":"Black","offer_id":47735241146517,"sku":"14:1202#Black","price":10.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0766\/0014\/8117\/files\/Sc8128c58c65549e2b70563c1d675e1f3j_ec45c278-2030-4359-b3d6-81afac61868c.webp?v=1786981274","url":"https:\/\/thejaksoniashop.com\/products\/dc-12v-output-3x-18650-battery-ups-diy-power-bank-box-for-router-cellphone-tablet-modem-cctv-camera-1","provider":"*The Jaksonia shop* ","version":"1.0","type":"link"}