{"product_id":"5v-boost-converter-li-ion-charger-module-1a-4-2v-led-display-ovp-otp-2pack","title":"5V Boost Converter + Li-ion Charger Module — 1A, 4.2V, LED Display, OVP\/OTP (2-Pack)","description":"\u003ch2\u003e5V Boost Converter + Li-ion Charger Module — 1A, 4.2V, LED Display, OVP\/OTP (2-Pack)\u003c\/h2\u003e\u003cp\u003eThis \u003cstrong\u003eintegrated boost converter and Li-ion charger module\u003c\/strong\u003e combines a 4.2V lithium battery charger with a 5V\/1A boost converter in a single compact PCB. It enables you to build a complete DIY USB power bank — charge a single 18650 cell via USB input, then boost the cell voltage back to stable 5V for USB output. Supplied as a 2-pack for prototyping and production builds.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003e3.7V – 5.5V (USB 5V typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharging Current\u003c\/td\u003e\n\u003ctd\u003e1A max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharging Voltage\u003c\/td\u003e\n\u003ctd\u003e4.2V ±1%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage\u003c\/td\u003e\n\u003ctd\u003e5V (boost regulated)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Current\u003c\/td\u003e\n\u003ctd\u003e1A max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEfficiency\u003c\/td\u003e\n\u003ctd\u003eUp to 85%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDischarge Stop Voltage\u003c\/td\u003e\n\u003ctd\u003e2.9V (cell protection)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandby Current\u003c\/td\u003e\n\u003ctd\u003e8μA max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Indicator\u003c\/td\u003e\n\u003ctd\u003eRed flashing = charging \/ Red solid = full\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtections\u003c\/td\u003e\n\u003ctd\u003eOVP, short circuit, overload, overcharge, overdischarge, OTP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCharging Mode\u003c\/td\u003e\n\u003ctd\u003eTrickle + constant current + constant voltage + zero-voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack Quantity\u003c\/td\u003e\n\u003ctd\u003e2 modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eWhy Choose This Module?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003eAll-in-one design\u003c\/strong\u003e — charger + boost converter in one PCB, no extra components needed\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eZero-voltage charging\u003c\/strong\u003e — recovers deeply discharged Li-ion cells\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e8μA standby current\u003c\/strong\u003e — minimal battery drain when idle\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eFull protection suite\u003c\/strong\u003e — OVP, OTP, short circuit, overcharge, overdischarge\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eLED charge indicator\u003c\/strong\u003e — clear charging status at a glance\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e2-pack value\u003c\/strong\u003e — prototype one, deploy one\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDIY 18650 USB power bank build\u003c\/li\u003e\n\u003cli\u003ePortable Arduino \/ ESP32 5V power supply\u003c\/li\u003e\n\u003cli\u003eSolar Li-ion charge + 5V USB output system\u003c\/li\u003e\n\u003cli\u003eWearable device integrated power module\u003c\/li\u003e\n\u003cli\u003eEmergency phone charger build\u003c\/li\u003e\n\u003cli\u003eIoT sensor node battery management\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e2 × 5V Boost Converter + Li-ion Charger Module\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991431729387,"sku":"\u003cnone\u003e","price":7.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/5v-boost-converter-lithium-battery-charging-led-diy-charger.webp?v=1761883003","url":"https:\/\/keszoox.com\/products\/5v-boost-converter-li-ion-charger-module-1a-4-2v-led-display-ovp-otp-2pack","provider":"Keszoox","version":"1.0","type":"link"}