{"product_id":"1s-bms-18650-li-ion-fast-charge-module-usb-c-pd-18w","title":"1S BMS 18650 Li-ion Fast Charge Module USB-C PD 18W","description":"\u003cp\u003eUpgrade your DIY power bank or battery project with this compact \u003cstrong\u003e1S BMS 18650 Li-ion Fast Charge Module\u003c\/strong\u003e. Measuring just 28 × 28 mm, this thumbnail-sized board packs serious performance — supporting \u003cstrong\u003eUSB-C PD bi-directional fast charging\u003c\/strong\u003e at up to 18W, making it one of the most capable single-cell charge\/discharge modules available for makers and electronics enthusiasts.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePD Bi-Directional Fast Charging:\u003c\/strong\u003e Supports both fast charge input and fast discharge output via USB-C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Input\/Output Power:\u003c\/strong\u003e 18W\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Charge\/Discharge Current:\u003c\/strong\u003e Up to 4A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Charge Cut-off Voltage:\u003c\/strong\u003e 4.2V \/ 4.35V (selectable)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Voltage:\u003c\/strong\u003e 3.7V \/ 4.2V 1S lithium-ion and lithium polymer cells (e.g. 18650)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Charge-Discharge Board:\u003c\/strong\u003e Combines BMS protection, charging, and boost functions in one module\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e 28 × 28 mm metal construction — ideal for space-constrained builds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAvailable in 2 color options\u003c\/strong\u003e to suit your project aesthetic\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInput Voltage:\u003c\/strong\u003e DC 5V (USB)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Voltage:\u003c\/strong\u003e 3.7V \/ 4.2V (1S Li-ion \/ LiPo)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Charge Protocol:\u003c\/strong\u003e USB Power Delivery (PD)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Current:\u003c\/strong\u003e 4A (input \u0026amp; output)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Power:\u003c\/strong\u003e 18W\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 28 × 28 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eEnsure connecting wires between the battery and the module are kept \u003cstrong\u003eshort and thick\u003c\/strong\u003e to minimize resistance and heat at high current.\u003c\/li\u003e\n  \u003cli\u003eIf using an optional battery protection board, it \u003cstrong\u003emust sustain a minimum 4A output current\u003c\/strong\u003e to avoid triggering protection cutoff during fast discharge.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eIdeal For\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eDIY power banks and portable battery packs\u003c\/li\u003e\n  \u003cli\u003eHobbyist and maker electronics projects\u003c\/li\u003e\n  \u003cli\u003e18650 cell charging and protection circuits\u003c\/li\u003e\n  \u003cli\u003eRapid prototyping of USB-C powered devices\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor guidance on safe lithium battery handling and electronics safety standards, visit the U.S. Consumer Product Safety Commission – Lithium Battery Safety.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does the 1S BMS 18650 Li-ion Fast Charge Module do?\u003c\/h4\u003e\n\u003cp\u003eA: This module is a compact 3.7V\/4.2V lithium-ion charge-discharge integrated board. It combines battery management (BMS), USB-C PD fast charging, and boost discharge functions into a single 28 × 28 mm board. It supports up to 4A current and 18W power, making it ideal for DIY power bank builds and portable electronics projects.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this module compatible with 18650 batteries?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The module is designed for 1S (single-cell) 3.7V\/4.2V lithium-ion and lithium polymer cells, including standard 18650 format batteries. Simply connect your cell to the battery pads on the board following the polarity markings.\u003c\/p\u003e\n\u003ch4\u003eQ: What USB fast charge protocol does this module support?\u003c\/h4\u003e\n\u003cp\u003eA: The module supports USB Power Delivery (PD) bi-directional fast charging, enabling up to 18W of power for both charging the connected battery and powering output devices via USB-C.\u003c\/p\u003e\n\u003ch4\u003eQ: Are there any wiring precautions I should follow?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — because the module operates at up to 4A, it is critical to use short, thick wires between the battery and the module. Long or thin wires introduce resistance that can cause voltage drops and excessive heat at high current levels.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the 1S BMS 18650 Li-ion Fast Charge Module do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This module is a compact 3.7V\/4.2V lithium-ion charge-discharge integrated board. It combines battery management (BMS), USB-C PD fast charging, and boost discharge functions into a single 28 × 28 mm board. It supports up to 4A current and 18W power, making it ideal for DIY power bank builds and portable electronics projects.\"}}, {\"@type\": \"Question\", \"name\": \"Is this module compatible with 18650 batteries?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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