{"product_id":"5v-2a-power-bank-charger-module-diy-18650-boost-circuit-board","title":"5V 2A Power Bank Charger Module DIY 18650 Boost Circuit Board","description":"\u003ch2\u003e5V 1A\/2A Power Bank Charger Module – DIY 18650 Step-Up Boost Charging Circuit Board\u003c\/h2\u003e\n\u003cp\u003eBuild your own portable power bank with this compact and reliable \u003cstrong\u003e5V 1A\/2A Power Bank Charger Module\u003c\/strong\u003e. Designed for DIY electronics enthusiasts, this step-up boost charging circuit board is compatible with standard 3.7V–4.2V lithium 18650 batteries and delivers a regulated 5V\/2A output — perfect for powering USB devices on the go.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput:\u003c\/strong\u003e DC 5V \/ 1A via Micro-USB (Android) interface\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e DC 5V \/ 2A (max)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Battery Voltage:\u003c\/strong\u003e 3.7V – 4.2V lithium-ion (18650 cells)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Configuration:\u003c\/strong\u003e Parallel connection only (NOT series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Terminals:\u003c\/strong\u003e B– (Negative) \/ B+ (Positive) clearly labeled\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBoard Type:\u003c\/strong\u003e Step-up boost charging circuit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Choose This Charging Module?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCompact DIY Design\u003c\/strong\u003e — Ideal for custom power bank builds and electronics projects\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eStep-Up Boost Technology\u003c\/strong\u003e — Efficiently converts 3.7V battery voltage up to stable 5V USB output\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003e2A Fast Output\u003c\/strong\u003e — Charges smartphones and other USB devices quickly\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eStandard Interface\u003c\/strong\u003e — Micro-USB (Android) input for easy charging compatibility\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eLabeled Terminals\u003c\/strong\u003e — Clear B+ and B– markings simplify battery wiring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e⚠️ Important Usage Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eBatteries \u003cstrong\u003emust be connected in parallel\u003c\/strong\u003e, never in series.\u003c\/li\u003e\n  \u003cli\u003eAlways \u003cstrong\u003etest each battery's voltage\u003c\/strong\u003e before installation — one faulty cell can affect the entire battery group.\u003c\/li\u003e\n  \u003cli\u003eDouble-check \u003cstrong\u003epositive (+) and negative (–) polarity\u003c\/strong\u003e before connecting. Reversed polarity will permanently damage the onboard IC.\u003c\/li\u003e\n  \u003cli\u003eEnsure all \u003cstrong\u003eexposed wiring is properly insulated\u003c\/strong\u003e to prevent short circuits and protect the mainboard.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× Lithium Battery Charger Circuit Board (18650 Step-Up Boost Module)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHelpful Resources\u003c\/h3\u003e\n\u003cp\u003eFor guidance on safe handling of lithium-ion batteries and electronics, visit the U.S. Consumer Product Safety Commission – Lithium-Ion Battery Safety Information.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Due to lighting conditions and monitor display settings, the actual product color may vary slightly from images shown. Please allow a 1–3 cm difference due to manual measurement.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: How many 18650 batteries can I connect to this power bank charger module?\u003c\/h4\u003e\n\u003cp\u003eA: You can connect multiple 18650 lithium-ion cells to this module, but they \u003cstrong\u003emust always be wired in parallel\u003c\/strong\u003e — never in series. Connecting batteries in series will damage the board's onboard IC. Always verify each battery's voltage before connecting and ensure correct B+ and B– polarity.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What devices can I charge with the 5V 2A output of this module?\u003c\/h4\u003e\n\u003cp\u003eA: The 5V\/2A USB output is compatible with most standard USB-charged devices including smartphones, Bluetooth earbuds, small tablets, and other low-to-mid power USB gadgets. It is ideal for DIY portable power bank projects using 18650 lithium cells.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What input is required to charge the 18650 batteries through this module?\u003c\/h4\u003e\n\u003cp\u003eA: The module accepts a DC 5V \/ 1A input via a Micro-USB (Android) interface. Use a standard 5V USB wall adapter or power source connected through a Micro-USB cable to charge the connected 18650 batteries.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this module safe to use for beginners in DIY electronics?\u003c\/h4\u003e\n\u003cp\u003eA: This module is designed for DIY use, but basic electronics knowledge is recommended. Always insulate exposed wiring, verify battery polarity, and test battery voltages before assembly to ensure safe and reliable operation of your power bank build.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How many 18650 batteries can I connect to this power bank charger module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"You can connect multiple 18650 lithium-ion cells to this module, but they must always be wired in parallel — never in series. Connecting batteries in series will damage the board's onboard IC. 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