{"product_id":"dc-5v-2-1a-diy-mobile-power-board-18650-li-ion-charge-discharge-boost-module","title":"DC 5V 2.1A DIY Power Board 18650 Li-ion Charge Discharge Module","description":"\u003ch2\u003eDC 5V 2.1A DIY Mobile Power Board — 18650 Li-ion Charge\/Discharge Module\u003c\/h2\u003e\n\u003cp\u003eTake your electronics DIY projects to the next level with this versatile \u003cstrong\u003eDC 5V 2.1A Mobile Power DIY Board\u003c\/strong\u003e. Designed for makers, hobbyists, and electronics enthusiasts, this all-in-one module handles \u003cstrong\u003echarging, boosting, battery protection, and charge-level indication\u003c\/strong\u003e — everything you need to build your own custom power bank or portable power supply using a standard 3.7V 18650 lithium-ion cell.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAll-in-One Functionality:\u003c\/strong\u003e Combines 4.2V lithium charging, boost discharge (5V output), battery protection circuit, and LED charge indicator in a single compact board.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5V 2.1A Output:\u003c\/strong\u003e Delivers a stable 5V\/2.1A output — enough to charge smartphones, power microcontrollers, and drive other USB-powered devices.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with 3.7V 18650 Cells:\u003c\/strong\u003e Works seamlessly with standard 3.7V 18650 lithium-ion batteries, one of the most widely available rechargeable cell formats for DIY builds.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in Battery Protection:\u003c\/strong\u003e Integrated overcharge, over-discharge, and short-circuit protection helps preserve battery longevity and keep your build safe.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharge Indicator:\u003c\/strong\u003e Onboard LED indicator lets you monitor charging status at a glance — no guesswork required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Breadboard-Friendly:\u003c\/strong\u003e Small form factor fits neatly into custom enclosures, prototyping setups, and wearable electronics projects.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackaged in Electrostatic Bag:\u003c\/strong\u003e Safely packaged to protect sensitive components during transit and storage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e 5V DC (USB)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharge Voltage:\u003c\/strong\u003e 4.2V (for 3.7V Li-ion \/ 18650)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Voltage:\u003c\/strong\u003e 5V (boosted)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Current:\u003c\/strong\u003e 2.1A max\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Compatibility:\u003c\/strong\u003e 3.7V 18650 Lithium-Ion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModule Type:\u003c\/strong\u003e 5V Charge\/Discharge Integrated Module\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProtection:\u003c\/strong\u003e Overcharge, over-discharge, short-circuit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage:\u003c\/strong\u003e Electrostatic anti-static bag\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × DC 5V 2.1A Mobile Power DIY Board (4.2V Charge\/Discharge\/Boost\/Protection\/Indicator Module)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eCustom portable power bank builds\u003c\/li\u003e\n  \u003cli\u003eArduino, Raspberry Pi, and microcontroller projects\u003c\/li\u003e\n  \u003cli\u003eWearable electronics and IoT prototypes\u003c\/li\u003e\n  \u003cli\u003eSolar-charged battery systems\u003c\/li\u003e\n  \u003cli\u003eHobbyist electronics and maker labs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on lithium-ion battery safety and best practices for DIY electronics, visit the U.S. Consumer Product Safety Commission (CPSC) Lithium-Ion Battery Safety Center.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does this DC 5V 2.1A DIY power board do?\u003c\/h4\u003e\n\u003cp\u003eA: This all-in-one module integrates four functions on a single board: it charges a 3.7V 18650 lithium-ion battery up to 4.2V, boosts the battery's output back up to a stable 5V at up to 2.1A for powering external devices, provides built-in battery protection (overcharge, over-discharge, short circuit), and includes an LED indicator to display charging status. It's ideal for DIY power bank builds and portable electronics projects.\u003c\/p\u003e\n\u003ch4\u003eQ: Which battery type is compatible with this module?\u003c\/h4\u003e\n\u003cp\u003eA: This board is designed for use with standard 3.7V 18650 lithium-ion (Li-ion) rechargeable cells — one of the most common battery formats used in DIY electronics, flashlights, and portable power applications. It is not intended for use with other battery chemistries such as NiMH or LiPo without verifying compatibility.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use this board to charge my phone or power a microcontroller?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. With a 5V\/2.1A output, this module can charge most smartphones via USB and power popular microcontrollers like Arduino or Raspberry Pi. It effectively transforms an 18650 cell into a compact, rechargeable power supply suitable for a wide range of DIY and maker projects.\u003c\/p\u003e\n\u003ch4\u003eQ: How is the module protected during shipping?\u003c\/h4\u003e\n\u003cp\u003eA: The board is packaged in an electrostatic anti-static bag to protect sensitive electronic components from electrostatic discharge (ESD) damage during transit and storage.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does this DC 5V 2.1A DIY power board do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This all-in-one module integrates four functions on a single board: it charges a 3.7V 18650 lithium-ion battery up to 4.2V, boosts the battery's output back up to a stable 5V at up to 2.1A for powering external devices, provides built-in battery protection (overcharge, over-discharge, short circuit), and includes an LED indicator to display charging status. 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