{"product_id":"4s-16-8v-25a-bms-board-18650-lithium-battery-protection","title":"4S 16.8V 25A BMS Board for 18650 Lithium Battery Packs","description":"\n\u003ch2\u003e4S 16.8V 25A BMS Protection Board for 18650 Ternary Lithium Battery Packs\u003c\/h2\u003e\n\u003cp\u003eKeep your 18650 lithium battery packs running safely and efficiently with this compact 4S Battery Management System (BMS) board. Designed for 16.8V ternary lithium configurations at up to 25A, it delivers comprehensive electronic protection in a tiny 35×35mm footprint — ideal for power tools, solar LED lighting systems, and other battery-powered equipment.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAll-Round Circuit Protection:\u003c\/strong\u003e Built-in overcharge, over-discharge, over-current, and short-circuit protection safeguard your battery cells and connected devices, ensuring stable and secure operation at all times.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Engineered specifically for 4S 16.8V 25A ternary lithium battery configurations, it integrates seamlessly with 18650 battery packs used in power tools, solar LED lights, and similar applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Efficiency Circuit Design:\u003c\/strong\u003e Premium-grade electronic components deliver consistent voltage and current output, maximising battery utilisation efficiency and extending the service life of your devices.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Installation:\u003c\/strong\u003e Clearly labelled wiring ports and intuitive board markings make setup straightforward — no specialised expertise required. Most users can complete installation within minutes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable \u0026amp; Eco-Conscious:\u003c\/strong\u003e A longer-lasting BMS means fewer battery replacements over time, reducing waste and supporting a more sustainable approach to power management.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConfiguration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4S (4 cells in series)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e16.8V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContinuous Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Chemistry\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTernary Lithium (e.g. 18650)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePCB Board\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGreen + Black\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e35 × 35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\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 × 4S 16.8V 25A BMS Protection Board\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePlease allow a 2–3% size deviation due to manual measurement.\u003c\/li\u003e\n  \u003cli\u003eActual product color may differ slightly from images due to monitor display settings.\u003c\/li\u003e\n  \u003cli\u003eBattery cells, charger, and other accessories are \u003cstrong\u003enot included\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/t2-pure-bare-copper-wire-round-solid-uncoated-0-1-2mm-10m\"\u003eT2 Pure Bare Copper Wire 0.1–2mm Round Solid Uncoated 10M\u003c\/a\u003e — ideal for battery wiring and electrical projects.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/nitrile-work-gloves-anti-slip-full-finger-5-pair\"\u003e5-Pair Nitrile Work Gloves – Anti-Slip Full Finger Safety\u003c\/a\u003e — protect your hands during BMS installation and battery assembly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/10-pack-65mm-oscillating-multi-tool-saw-blades-high-carbon-steel\"\u003e10-Pack 65mm Oscillating Multi-Tool Saw Blades | Carbon Steel\u003c\/a\u003e — great companion for power tool maintenance and upgrades.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.energystar.gov\/products\" target=\"_blank\" rel=\"noopener\"\u003eENERGY STAR product efficiency guidance\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What battery type is this 4S BMS board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This BMS board is designed specifically for 4S ternary lithium battery packs (such as 18650 cells) configured at 16.8V with a continuous current rating of 25A. It is commonly used in power tools, solar LED lighting systems, and similar portable power applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What protection functions does this BMS board provide?\u003c\/h4\u003e\n\u003cp\u003eA: The board provides four key protection functions: overcharge protection, over-discharge protection, over-current protection, and short-circuit protection. Together, these safeguard both the battery cells and connected devices from damage during charging and discharging cycles.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this BMS board difficult to install?\u003c\/h4\u003e\n\u003cp\u003eA: No — the board features clearly labelled wiring ports and intuitive markings, making it straightforward to install even without professional electronics experience. Most users can complete the setup in just a few minutes.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this board come with batteries or a charger?\u003c\/h4\u003e\n\u003cp\u003eA: No. This listing includes only the BMS protection board (1 piece). Batteries, charger, and other accessories must be purchased separately.\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 type is this 4S BMS board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This BMS board is designed specifically for 4S ternary lithium battery packs (such as 18650 cells) configured at 16.8V with a continuous current rating of 25A. 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