{"product_id":"2s-3a-bms-lithium-ion-battery-charger-protection-board-7-4v-8-4v","title":"2S 3A BMS Lithium-Ion Battery Charger \u0026 Protection Board (7.4V \/ 8.4V)","description":"\u003cp data-path-to-node=\"5\" id=\"p-rc_fca9dfb3dabdbfed-90\"\u003e\u003cspan class=\"citation-146\"\u003eThe \u003c\/span\u003e\u003cb data-path-to-node=\"5\" data-index-in-node=\"4\"\u003e\u003cspan class=\"citation-146\"\u003e2S 3A BMS Lithium-Ion Protection Board\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-146 citation-end-146\"\u003e is a highly miniaturized battery management system designed specifically for two-cell (2S) 18650 or LiPo configurations.\u003csup class=\"superscript\" data-turn-source-index=\"2\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-145 citation-end-145\"\u003eWhile massive power-tool BMS boards handle extreme current, this ultra-slim module is engineered for smaller, more delicate electronics that require steady 7.4V power at a maximum continuous draw of 3 Amps.\u003csup class=\"superscript\" data-turn-source-index=\"3\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e It seamlessly serves a dual purpose: safely distributing 8.4V charging current across both cells, while simultaneously acting as an invisible safety net during discharge. \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\" id=\"p-rc_fca9dfb3dabdbfed-91\"\u003eBecause of its incredibly tiny footprint (barely wider than the edge of an 18650 cell), it is designed to be soldered and heat-shrinked directly against the battery pack, creating a streamlined, self-contained power source. \u003cspan class=\"citation-144 citation-end-144\"\u003eIt automatically monitors the voltage thresholds of the two series-connected cells, instantly cutting the circuit to prevent irreversible damage caused by overcharging, deep discharging, and accidental short-circuits.\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\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\"\u003eUltra-Compact Footprint:\u003c\/b\u003e Measuring only 36mm long and roughly 6mm wide, it sits perfectly flush against the bridge of a standard 18650 dual-battery pack, allowing for extremely low-profile power integration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,1,0\" id=\"p-rc_fca9dfb3dabdbfed-92\"\u003e\u003cspan class=\"citation-143\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"8,1,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-143\"\u003eContinuous 3A Discharge:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-143 citation-end-143\"\u003e Efficiently delivers a steady 3 Amps of current with brief transients up to 5 Amps, making it the ideal controller for low-drain 7.4V motors, LED arrays, and microcontrollers.\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=\"8,2,0\" id=\"p-rc_fca9dfb3dabdbfed-93\"\u003e\u003cspan class=\"citation-142\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"8,2,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-142\"\u003e4-Tier Active Protection:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-142 citation-end-142\"\u003e Constantly monitors the battery pack to cut off the circuit in the event of over-voltage (over-charging), under-voltage (deep discharging), over-current events, and hard short-circuits.\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=\"8,3,0\" id=\"p-rc_fca9dfb3dabdbfed-94\"\u003e\u003cspan class=\"citation-141\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"8,3,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-141\"\u003eAuto-Recovery System:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-141 citation-end-141\"\u003e If the board triggers a protection cut-off (such as detecting a short circuit), the system will automatically restore power output once the fault condition is removed and the charging voltage is applied.\u003csup class=\"superscript\" data-turn-source-index=\"7\"\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\"\u003e\u003cb data-path-to-node=\"8,4,0\" data-index-in-node=\"0\"\u003eSimple 5-Pad Wiring:\u003c\/b\u003e Clearly labeled solder pads (\u003ccode data-path-to-node=\"8,4,0\" data-index-in-node=\"50\"\u003eB+\u003c\/code\u003e, \u003ccode data-path-to-node=\"8,4,0\" data-index-in-node=\"54\"\u003eB-\u003c\/code\u003e, and the middle balancing bridge \u003ccode data-path-to-node=\"8,4,0\" data-index-in-node=\"90\"\u003eMB\u003c\/code\u003e) make it incredibly straightforward to wire up custom 2S packs on your workbench.\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\"\u003eDIY 7.4V Battery Packs:\u003c\/b\u003e The essential \"brain\" for safely bundling raw, unprotected 18650 or 21700 lithium-ion cells into reusable custom power banks.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"10,1,0\" id=\"p-rc_fca9dfb3dabdbfed-95\"\u003e\u003cspan class=\"citation-140\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"10,1,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-140\"\u003eSmall RC Toys \u0026amp; Robotics:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-140 citation-end-140\"\u003e Provides safe, steady voltage to lower-torque 7.4V DC gear motors and micro servos found in tabletop rovers and custom STEM robotics.\u003csup class=\"superscript\" data-turn-source-index=\"8\"\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=\"10,2,0\" id=\"p-rc_fca9dfb3dabdbfed-96\"\u003e\u003cb data-path-to-node=\"10,2,0\" data-index-in-node=\"0\"\u003ePortable Lighting:\u003c\/b\u003e\u003cspan class=\"citation-139 citation-end-139\"\u003e Ensures safe operation and prevents deep-discharge degradation in custom-built 7.4V LED flashlights and portable camera lighting rigs.\u003csup class=\"superscript\" data-turn-source-index=\"9\"\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=\"10,3,0\"\u003e\u003cb data-path-to-node=\"10,3,0\" data-index-in-node=\"0\"\u003eLow-Power Audio:\u003c\/b\u003e Protects the dedicated 2S power supply inside compact, custom-built Bluetooth speakers and portable desktop radios.\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_fca9dfb3dabdbfed-97\"\u003e\u003cb data-path-to-node=\"12,1,0\" data-index-in-node=\"0\"\u003eSupported Chemistry:\u003c\/b\u003e\u003cspan class=\"citation-138 citation-end-138\"\u003e Lithium-Ion (18650, 21700, etc.) or Lithium Polymer (LiPo)\u003csup class=\"superscript\" data-turn-source-index=\"10\"\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 Pack 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 appropriate 8.4V CC\/CV charging source)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,4,0\" id=\"p-rc_fca9dfb3dabdbfed-98\"\u003e\u003cspan class=\"citation-137\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"12,4,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-137\"\u003eMaximum Continuous Current:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-137 citation-end-137\"\u003e 3A\u003csup class=\"superscript\" data-turn-source-index=\"11\"\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=\"12,5,0\" id=\"p-rc_fca9dfb3dabdbfed-99\"\u003e\u003cb data-path-to-node=\"12,5,0\" data-index-in-node=\"0\"\u003ePeak \/ Transient Current:\u003c\/b\u003e\u003cspan class=\"citation-136 citation-end-136\"\u003e 5A\u003csup class=\"superscript\" data-turn-source-index=\"12\"\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\" id=\"p-rc_fca9dfb3dabdbfed-100\"\u003e\u003cspan class=\"citation-135\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"12,6,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-135\"\u003eOvercharge Detection Voltage:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-135 citation-end-135\"\u003e 4.25V to 4.35V (±0.05V) per cell\u003csup class=\"superscript\" data-turn-source-index=\"13\"\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=\"12,7,0\" id=\"p-rc_fca9dfb3dabdbfed-101\"\u003e\u003cb data-path-to-node=\"12,7,0\" data-index-in-node=\"0\"\u003eOver-Discharge Detection Voltage:\u003c\/b\u003e\u003cspan class=\"citation-134 citation-end-134\"\u003e 2.3V to 3.0V (±0.05V) per cell\u003csup class=\"superscript\" data-turn-source-index=\"14\"\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=\"12,8,0\" id=\"p-rc_fca9dfb3dabdbfed-102\"\u003e\u003cb data-path-to-node=\"12,8,0\" data-index-in-node=\"0\"\u003eQuiescent Standby Current:\u003c\/b\u003e\u003cspan class=\"citation-133 citation-end-133\"\u003e \u0026lt; 3µA (Will not rapidly drain the battery while sitting idle)\u003csup class=\"superscript\" data-turn-source-index=\"15\"\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=\"12,9,0\" id=\"p-rc_fca9dfb3dabdbfed-103\"\u003e\u003cb data-path-to-node=\"12,9,0\" data-index-in-node=\"0\"\u003eInternal Resistance:\u003c\/b\u003e\u003cspan class=\"citation-132 citation-end-132\"\u003e \u0026lt; 45mΩ\u003csup class=\"superscript\" data-turn-source-index=\"16\"\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=\"12,10,0\" id=\"p-rc_fca9dfb3dabdbfed-104\"\u003e\u003cspan class=\"citation-131\"\u003e\u003c\/span\u003e\u003cb data-path-to-node=\"12,10,0\" data-index-in-node=\"0\"\u003e\u003cspan class=\"citation-131\"\u003eApproximate Dimensions:\u003c\/span\u003e\u003c\/b\u003e\u003cspan class=\"citation-131 citation-end-131\"\u003e 36 mm x 6.5 mm x 2 mm\u003csup class=\"superscript\" data-turn-source-index=\"17\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"K-TECHNICS","offers":[{"title":"Default Title","offer_id":42857608773703,"sku":null,"price":250.0,"currency_code":"KES","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/7637\/2039\/files\/14589-e67ed2.jpg?v=1780904221","url":"https:\/\/www.ktechnics.com\/products\/2s-3a-bms-lithium-ion-battery-charger-protection-board-7-4v-8-4v","provider":"K-TECHNICS","version":"1.0","type":"link"}