{"product_id":"3s-12v-18650-li-ion-battery-protection-board-bms-25a-balance","title":"3S 12V 18650 BMS Li-Ion Battery Protection Board 25A Balance","description":"\n\u003ch2\u003e3S 12V 18650 Li-Ion Battery Protection Board with Balance | 25A | 11.1V–12.6V\u003c\/h2\u003e\n\u003cp\u003eKeep your 3-cell lithium-ion battery packs running safely and efficiently with this high-quality \u003cstrong\u003e3S BMS Protection Board\u003c\/strong\u003e. Designed for 18650 Li-ion cells configured in a 3-series arrangement (11.1V nominal \/ 12.6V fully charged), this compact module guards against overcharge, over-discharge, overcurrent, and short circuits — all while actively balancing cell voltages for a longer, healthier battery life.\u003c\/p\u003e\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Accuracy Voltage Detection:\u003c\/strong\u003e Precisely monitors each cell to trigger protection thresholds with minimal error (±0.05V).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Voltage Charger Terminal:\u003c\/strong\u003e Charger-side input rated for high-voltage compatibility, ensuring safe charging cycles.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThree-Stage Overcurrent Detection:\u003c\/strong\u003e Detects overcurrent Level 1, overcurrent Level 2, and load short-circuit conditions independently for layered protection.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMOS Transistor Control:\u003c\/strong\u003e MOSFET switching technology precisely manages both charge and discharge paths.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCell Balancing Function:\u003c\/strong\u003e Passive balancing keeps all three cells at matched voltage levels, extending overall pack lifespan.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Low Standby Current:\u003c\/strong\u003e Only 50µA standby draw — ideal for applications where the battery sits idle for extended periods.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShort-Circuit Recoverable:\u003c\/strong\u003e After a short-circuit event, reconnecting a charger automatically resets and restores the board.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eConfiguration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e3S (3 cells in series)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eNominal Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e11.1V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eFull Charge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e12.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eOvercharge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e4.25–4.35V ±0.05V per cell\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eOver-Discharge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e2.3–3.0V ±0.05V per cell\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMax Continuous Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e25A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMax Peak Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e35–40A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eStandby Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e50µA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eInternal Resistance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u0026lt;100mΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eRated Life\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u0026gt;30,000 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eWorking Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e-40°C to +50°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e-40°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eBoard Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e56 × 45 × 4.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 3S 12V Li-Ion Battery Protection Board (BMS) with Balance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cp\u003eThis BMS module is well suited for DIY power banks, electric tools, e-bikes, RC vehicles, solar storage, and any custom 3S 18650 battery pack project where reliable, multi-layer protection is essential.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-4-inch-npt-nickel-plated-brass-air-compressor-tank-fill-valve\"\u003e1\/4\" NPT Nickel Plated Brass Air Compressor Tank Fill Valve\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/hex-shank-wire-twister-drill-attachment-rebar-tie-tool\"\u003e1\/4\" Hex Shank Wire Twister Drill Attachment | Rebar Tie Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-2-inch-drive-wheel-protector-impact-socket-set-storage-case\"\u003e1\/2\" Drive Wheel Protector Impact Socket Set + Storage Case\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSafety \u0026amp; Standards Reference\u003c\/h3\u003e\n\u003cp\u003eFor guidance on the safe handling and disposal of lithium-ion batteries, refer to the U.S. Consumer Product Safety Commission — Lithium-Ion Battery Safety resource.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Battery_management_system\" target=\"_blank\" rel=\"noopener\"\u003eBattery management system\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does a 3S BMS protection board do for my Li-ion battery pack?\u003c\/h4\u003e\n\u003cp\u003eA: A 3S Battery Management System (BMS) board monitors and protects three lithium-ion cells connected in series. It prevents overcharging (above ~4.25–4.35V per cell), over-discharging (below ~2.3–3.0V per cell), overcurrent events up to 25A continuous, and short circuits. The built-in balancing function also keeps all three cells at equal voltage levels, which maximizes the usable capacity and overall lifespan of your battery pack.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this board compatible with standard 18650 Li-ion cells?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. This protection board is specifically designed for 3 × 18650 lithium-ion cells wired in series (3S configuration), giving a nominal pack voltage of 11.1V and a fully charged voltage of 12.6V. It is compatible with standard 18650 Li-ion cells and widely used in DIY power tools, RC applications, e-bikes, power banks, and solar storage projects.\u003c\/p\u003e\n\u003ch4\u003eQ: What happens if a short circuit occurs — is the board permanently damaged?\u003c\/h4\u003e\n\u003cp\u003eA: No. This board features recoverable short-circuit protection. If a short-circuit event is detected, the board cuts power to protect your cells. Simply reconnect a compatible charger to reset the board and restore normal operation — no replacement is needed after a standard short-circuit event.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the maximum current this BMS can handle continuously?\u003c\/h4\u003e\n\u003cp\u003eA: The board supports a maximum continuous working current of 25A, with peak current handling of 35–40A for brief transient loads. Internal resistance is rated at less than 100mΩ to minimize energy loss during operation.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does a 3S BMS protection board do for my Li-ion battery pack?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A 3S Battery Management System (BMS) board monitors and protects three lithium-ion cells connected in series. It prevents overcharging (above ~4.25–4.35V per cell), over-discharging (below ~2.3–3.0V per cell), overcurrent events up to 25A continuous, and short circuits. 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Internal resistance is rated at less than 100mΩ to minimize energy loss during operation.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/0i45ne-c8.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/0i45ne-c8.myshopify.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"3S 12V 18650 BMS Li-Ion Battery Protection Board 25A Balance\", \"item\": \"https:\/\/0i45ne-c8.myshopify.com\/products\/3s-12v-18650-li-ion-battery-protection-board-bms-25a-balance\"}]}\u003c\/script\u003e","brand":"Zpaxo","offers":[{"title":"1pc","offer_id":54189442564406,"sku":"14:1202#1pc","price":9.29,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0989\/7774\/3158\/files\/S440e37b36bac41ad9b9cf99219d4fce63.webp?v=1783274284","url":"https:\/\/0i45ne-c8.myshopify.com\/products\/3s-12v-18650-li-ion-battery-protection-board-bms-25a-balance","provider":"Zpaxo","version":"1.0","type":"link"}