{"product_id":"flashlight-driver-board-17-20mm-led-18650-battery-diy","title":"Flashlight Driver Board 17\/20mm 6-15W LED 18650 Battery DIY","description":"\u003ch2\u003eFlashlight Driver Board – 17mm \u0026amp; 20mm | 6–15W LED | 18650 Battery Compatible\u003c\/h2\u003e\n\u003cp\u003eUpgrade or build your own high-power flashlight with this compact, reliable \u003cstrong\u003eLED driver board\u003c\/strong\u003e. Designed for DIY enthusiasts and electronics hobbyists, this single-gear driver board delivers a stable 1.8–2.3A output current to power 6–15W LED beads — all from a single 18650 lithium battery. Available in two sizes: \u003cstrong\u003e17mm (red)\u003c\/strong\u003e and \u003cstrong\u003e20mm (blue)\u003c\/strong\u003e to fit the most common flashlight tube diameters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide LED Compatibility:\u003c\/strong\u003e Supports 6–15W (3V) LED bulbs, ideal for a broad range of DIY flashlight builds.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e18650 Battery Ready:\u003c\/strong\u003e Input voltage of DC 3.7–4.2V — perfectly matched to a single 18650 lithium cell.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStable Current Output:\u003c\/strong\u003e Delivers 1.8–2.3A for consistent, flicker-free performance from high-power LEDs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Mini Board Design:\u003c\/strong\u003e Ultra-small form factor fits neatly inside standard flashlight housings without modification.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSimplified Single-Gear Circuit:\u003c\/strong\u003e One-step drive design reduces circuit complexity and improves long-term reliability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTwo Size Options:\u003c\/strong\u003e 17mm diameter (red board) and 20mm diameter (blue board) for mainstream flashlight tubes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eGear\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e1st Gear (Single Mode)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eDC 3.7–4.2V (1× 18650 battery)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eOutput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eDC 3.0–3.3V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eOutput Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e1.8–2.3A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eApplicable LED Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e6–15W (3V LEDs)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eBoard Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e17mm (red) \/ 20mm (blue)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eCompatible Battery\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e18650 Lithium Battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× Flashlight Driver Board (choose 17mm or 20mm)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eColors may vary slightly from product images due to screen and lighting differences.\u003c\/li\u003e\n  \u003cli\u003ePlease allow 1mm–1cm tolerance due to manual measurement.\u003c\/li\u003e\n  \u003cli\u003eEnsure your selected LED bead operates at 3V and falls within the 6–15W power range for best compatibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor general electrical safety guidance on DIY electronics projects, visit the U.S. Consumer Product Safety Commission (CPSC).\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Printed_circuit_board\" target=\"_blank\" rel=\"noopener\"\u003ePrinted circuit board\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What size flashlight driver board should I choose — 17mm or 20mm?\u003c\/h4\u003e\n\u003cp\u003eA: Choose based on the inner diameter of your flashlight tube. The \u003cstrong\u003e17mm red board\u003c\/strong\u003e suits smaller flashlight housings, while the \u003cstrong\u003e20mm blue board\u003c\/strong\u003e fits larger, more common tube diameters. Measure your flashlight's driver cavity before ordering.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this flashlight driver board compatible with all 18650 batteries?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — the board accepts an input voltage of DC 3.7–4.2V, which matches the standard charge range of most 18650 lithium-ion batteries, making it an ideal single-cell DIY flashlight driver solution.\u003c\/p\u003e\n\u003ch4\u003eQ: What LED wattage works best with this driver board?\u003c\/h4\u003e\n\u003cp\u003eA: This driver board is optimized for \u003cstrong\u003e6W to 15W LED beads rated at 3V\u003c\/strong\u003e. Using LEDs within this power range ensures stable current delivery and reliable long-term performance. Do not exceed 15W to avoid overloading the board.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use this board in a multi-mode flashlight build?\u003c\/h4\u003e\n\u003cp\u003eA: This is a single-gear (1-mode) driver board, meaning it operates at one constant output level. It is best suited for simple, always-on flashlight builds. For multi-mode builds requiring high\/medium\/low settings, a multi-mode driver board would be required.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What size flashlight driver board should I choose — 17mm or 20mm?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Choose based on the inner diameter of your flashlight tube. The 17mm red board suits smaller flashlight housings, while the 20mm blue board fits larger, more common tube diameters. 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