{"product_id":"2s-8-4v-bms-battery-protection-board-balancing-18650-32650","title":"2S 8.4V BMS Battery Protection Board with Balancing | 1–5 Pcs","description":"\n\u003ch2\u003e2S LiFePO4 Battery Management System (BMS) with Cell Balancing\u003c\/h2\u003e\n\u003cp\u003eKeep your 2S lithium battery packs running safely and efficiently with the HUXUAN 2S 8.4V BMS Protection Board. Designed for 32650 and 18650 cell configurations, this compact board delivers reliable multi-layer protection — all in a lightweight plastic and metal housing measuring just 46 × 22 mm. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 2S (2-cell series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Voltage:\u003c\/strong\u003e 6.4V \/ 7.4V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharge Cutoff Voltage:\u003c\/strong\u003e 8.4V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContinuous Discharge Current:\u003c\/strong\u003e 10A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Cells:\u003c\/strong\u003e 32650, 18650 Li-Ion \/ LiFePO4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 46 × 22 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic + Metal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePack Options:\u003c\/strong\u003e 1 pc or 5 pcs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBuilt-In Protection Functions\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eOvercharge Protection\u003c\/strong\u003e — cuts off charging when cells reach maximum voltage\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eOver-Discharge Protection\u003c\/strong\u003e — prevents cells from draining below safe thresholds\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eShort Circuit Protection\u003c\/strong\u003e — instantly disconnects load in fault conditions\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eOvercurrent Protection\u003c\/strong\u003e — limits current to safe operating levels\u003c\/li\u003e\n  \u003cli\u003e✅ \u003cstrong\u003eCell Balancing\u003c\/strong\u003e — equalizes voltage across both cells for extended cycle life\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\n\u003cp\u003eThis BMS board is perfectly suited for a wide variety of DIY and professional battery pack builds, including:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMassager battery packs\u003c\/li\u003e\n  \u003cli\u003eLED light backup power supplies\u003c\/li\u003e\n  \u003cli\u003e12V electronic products\u003c\/li\u003e\n  \u003cli\u003eSolar street light battery packs\u003c\/li\u003e\n  \u003cli\u003eMonitoring\/surveillance backup power supplies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWiring Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eB+\u003c\/strong\u003e → Positive pole of the battery\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eB−\u003c\/strong\u003e → Negative pole of the battery\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMB\u003c\/strong\u003e → Connection point between Battery 1 and Battery 2 (mid-point)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eP+\u003c\/strong\u003e → Positive pole of the charge\/discharge terminal (shared)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eP−\u003c\/strong\u003e → Negative pole of the charge\/discharge terminal (shared)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTip:\u003c\/strong\u003e When assembling battery packs, ensure cells are matched in voltage, capacity, and internal resistance as closely as possible. Cells should be near the rated 3.7V. If there is no output after assembly, charge the pack at 8.4V to activate the board.\u003c\/p\u003e\n\n\u003ch3\u003eImportant Usage Notes\u003c\/h3\u003e\n\u003cp\u003eThis board is \u003cstrong\u003enot suitable\u003c\/strong\u003e for use with: lithium iron phosphate batteries (LiFePO4 chemistry packs), xenon\/HID (hernia) lamps, hand drill battery packs, electric fishing machine packs, electric bicycle battery packs, children's ride-on car batteries, motors rated 550 class or above, or 1W fisheye LED lights. Please verify compatibility before purchase.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10pcs-wooden-handle-nylon-bristle-paint-brush-for-oil-painting-dusting-and-cleaning-unrechargeable-hand-tool-set-without-batt-2\"\u003e10Pcs Wooden Handle Nylon Bristle Paint Brush – Hand Tool Set\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-precision-japanese-double-edged-hand-saw-sk5-steel-fine-toothed-for-carpentry-and-gardening-6-inch-blade-portable-mini-1\"\u003e1pc Precision Japanese Double-Edged Hand Saw – SK5 Steel\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-professional-heavy-duty-pruning-shears-with-anti-slip-handle-design-suitable-for-trimming-thick-and-sturdy-branches\"\u003e1pc Professional Heavy-Duty Pruning Shears with Anti-Slip Handle\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.epa.gov\/recycle\/used-lithium-ion-batteries\" target=\"_blank\" rel=\"noopener\"\u003eEPA guidance on lithium-ion battery handling\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What battery types are compatible with this 2S BMS protection board?\u003c\/h4\u003e\n\u003cp\u003eA: This BMS board is designed for 2-cell series (2S) Li-Ion battery packs using 18650 or 32650 cylindrical cells operating at a nominal voltage of 6.4V–7.4V with an 8.4V charge cutoff. It is not intended for standard lithium iron phosphate (LiFePO4) chemistry packs or high-draw applications such as power tools or electric bikes.\u003c\/p\u003e\n\u003ch4\u003eQ: Does the board support both charging and discharging through the same terminals?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The P+ and P− terminals are shared for both charging and discharging, making wiring straightforward. Simply connect your charge\/discharge leads to P+ and P−, and wire the battery cells to B+, MB, and B− as described in the wiring guide above.\u003c\/p\u003e\n\u003ch4\u003eQ: What is cell balancing and why does it matter?\u003c\/h4\u003e\n\u003cp\u003eA: Cell balancing is a function that equalizes the voltage between the two cells in the series pack. Over time, cells can drift apart in voltage, which can reduce overall capacity and shorten pack lifespan. The built-in balancing circuit on this BMS automatically keeps both cells at matched voltages, helping maintain performance and extend the number of usable charge cycles.\u003c\/p\u003e\n\u003ch4\u003eQ: Is the 5-pack a better value for DIY projects?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. If you are building multiple battery packs — for example, several LED backup lights or solar storage units — the 5-piece option provides a cost-effective supply. All boards in the pack are identical in specification to the single unit.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What battery types are compatible with this 2S BMS protection board?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This BMS board is designed for 2-cell series (2S) Li-Ion battery packs using 18650 or 32650 cylindrical cells operating at a nominal voltage of 6.4V–7.4V with an 8.4V charge cutoff. 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