{"product_id":"2s-20a-bms-lithium-battery-protection-board-with-cell-balancing-7-4v-8-4v","title":"2S 20A BMS Lithium Battery Protection Board with Cell Balancing (7.4V \/ 8.4V)","description":"\u003cp data-path-to-node=\"5\" id=\"p-rc_63e4c918fb3c16d3-451\"\u003eBuilding a multi-cell lithium battery pack requires strict voltage management, and the \u003cb data-path-to-node=\"5\" data-index-in-node=\"87\"\u003e2S 20A Battery Management System (BMS)\u003c\/b\u003e is the critical brain your project needs. \u003cspan class=\"citation-514 citation-end-514\"\u003eDesigned specifically for two-cell (2S) 18650 or LiPo configurations, this board serves as a comprehensive safety shield.\u003csup class=\"superscript\" data-turn-source-index=\"1\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-513 citation-end-513\"\u003eIt actively monitors the battery pack to prevent catastrophic damage from overcharging, deep discharging, overcurrent draws, and accidental short circuits.\u003csup class=\"superscript\" data-turn-source-index=\"2\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"6\"\u003eWhat sets this specific board apart from basic protection circuits is its integrated cell balancing feature. In series configurations, batteries inevitably charge and discharge at slightly different rates. The onboard balancing circuitry safely bleeds off excess voltage from the highest-charged cell, ensuring both cells reach exactly 4.2V simultaneously. This prevents one cell from taking all the strain, dramatically extending the overall lifespan and usable capacity of your power bank.\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003e\u003cb data-path-to-node=\"7\" data-index-in-node=\"0\"\u003eKey Features \u0026amp; Functional Advantages:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"8\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,0,0\"\u003e\u003cb data-path-to-node=\"8,0,0\" data-index-in-node=\"0\"\u003eHigh-Current Handling:\u003c\/b\u003e Capable of sustaining a continuous discharge current of up to 20 Amps, making it tough enough to handle the sudden power spikes of DC motors and heavy mechanical loads.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,1,0\"\u003e\u003cb data-path-to-node=\"8,1,0\" data-index-in-node=\"0\"\u003eActive Cell Balancing:\u003c\/b\u003e Features integrated balancing resistors that continuously equalize the voltage between the two series cells during the final charging phase, maximizing total pack capacity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,2,0\"\u003e\u003cb data-path-to-node=\"8,2,0\" data-index-in-node=\"0\"\u003eComprehensive Safety Suite:\u003c\/b\u003e Automatically cuts off the circuit if a cell drops dangerously low (preventing permanent chemistry damage) or if voltage spikes too high (preventing thermal runaway and fires).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,3,0\" id=\"p-rc_63e4c918fb3c16d3-452\"\u003e\u003cspan class=\"citation-512\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"8,3,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-512\"\u003eShort Circuit Protection:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-512 citation-end-512\"\u003e Instantly breaks the connection if a hard short circuit is detected on the output, safeguarding both your electronics and your immediate environment.\u003csup class=\"superscript\" data-turn-source-index=\"3\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,4,0\" id=\"p-rc_63e4c918fb3c16d3-453\"\u003e\u003cb data-path-to-node=\"8,4,0\" data-index-in-node=\"0\"\u003eLow-Profile Footprint:\u003c\/b\u003e\u003cspan class=\"citation-511 citation-end-511\"\u003e The extremely compact PCB design allows it to be easily heat-shrinked directly onto a pair of 18650 cells without adding unnecessary bulk to your enclosure.\u003csup class=\"superscript\" data-turn-source-index=\"4\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"9\"\u003e\u003cb data-path-to-node=\"9\" data-index-in-node=\"0\"\u003ePerfect For:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"10\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,0,0\"\u003e\u003cb data-path-to-node=\"10,0,0\" data-index-in-node=\"0\"\u003ePower Tool Battery Rebuilds:\u003c\/b\u003e The ideal replacement BMS for resurrecting dead 7.2V\/7.4V cordless drill, screwdriver, and rotary tool battery packs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,1,0\"\u003e\u003cb data-path-to-node=\"10,1,0\" data-index-in-node=\"0\"\u003eCustom Robotics \u0026amp; RC:\u003c\/b\u003e Provides safe, sustained high-amperage power to 12V-class motor drivers, servos, and robotic chassis operating on a 2S power plan.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,2,0\"\u003e\u003cb data-path-to-node=\"10,2,0\" data-index-in-node=\"0\"\u003ePortable Audio Systems:\u003c\/b\u003e Protects the internal lithium power supply inside custom-built Bluetooth speakers and portable amplifiers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,3,0\"\u003e\u003cb data-path-to-node=\"10,3,0\" data-index-in-node=\"0\"\u003eHigh-Power LED Arrays:\u003c\/b\u003e Ensures stable, safe power delivery to portable floodlights, biking headlamps, and heavy-duty flashlight mods.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"11\"\u003e\u003cb data-path-to-node=\"11\" data-index-in-node=\"0\"\u003eTechnical Specifications:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"12\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,0,0\"\u003e\u003cb data-path-to-node=\"12,0,0\" data-index-in-node=\"0\"\u003eConfiguration:\u003c\/b\u003e 2S (2 Cells in Series)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,1,0\" id=\"p-rc_63e4c918fb3c16d3-454\"\u003e\u003cb data-path-to-node=\"12,1,0\" data-index-in-node=\"0\"\u003eSupported Chemistry:\u003c\/b\u003e\u003cspan class=\"citation-510 citation-end-510\"\u003e Lithium-Ion (18650, 21700) or Lithium Polymer (LiPo)\u003csup class=\"superscript\" data-turn-source-index=\"5\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,2,0\"\u003e\u003cb data-path-to-node=\"12,2,0\" data-index-in-node=\"0\"\u003eNominal Voltage:\u003c\/b\u003e 7.4V\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,3,0\"\u003e\u003cb data-path-to-node=\"12,3,0\" data-index-in-node=\"0\"\u003eFull Charge Voltage:\u003c\/b\u003e 8.4V (Requires an 8.4V CC\/CV charger)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,4,0\"\u003e\u003cb data-path-to-node=\"12,4,0\" data-index-in-node=\"0\"\u003eMaximum Continuous Discharge Current:\u003c\/b\u003e 20A\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,5,0\" id=\"p-rc_63e4c918fb3c16d3-455\"\u003e\u003cspan class=\"citation-509\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"12,5,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-509\"\u003eOvercharge Detection Voltage:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-509 citation-end-509\"\u003e 4.25V to 4.35V (per cell)\u003csup class=\"superscript\" data-turn-source-index=\"6\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,6,0\"\u003e\u003cb data-path-to-node=\"12,6,0\" data-index-in-node=\"0\"\u003eOver-discharge Detection Voltage:\u003c\/b\u003e 2.5V to 3.0V (per cell)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,7,0\"\u003e\u003cb data-path-to-node=\"12,7,0\" data-index-in-node=\"0\"\u003eBalancing Current:\u003c\/b\u003e ~45mA\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,8,0\"\u003e\u003cb data-path-to-node=\"12,8,0\" data-index-in-node=\"0\"\u003eApproximate Dimensions:\u003c\/b\u003e 46 mm x 20 mm x 3 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"K-TECHNICS","offers":[{"title":"Default Title","offer_id":42853813452871,"sku":null,"price":280.0,"currency_code":"KES","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/7637\/2039\/files\/71neHi8cQvL._AC_SL1500.jpg?v=1780778380","url":"https:\/\/www.ktechnics.com\/products\/2s-20a-bms-lithium-battery-protection-board-with-cell-balancing-7-4v-8-4v","provider":"K-TECHNICS","version":"1.0","type":"link"}