{"product_id":"3s-25a-bms-lithium-ion-battery-protection-board-with-cell-balancing-11-1v-12-6v","title":"3S 25A BMS Lithium-Ion Battery Protection Board with Cell Balancing (11.1V \/ 12.6V)","description":"\u003cp data-path-to-node=\"5\"\u003eThe \u003cb data-path-to-node=\"5\" data-index-in-node=\"4\"\u003e3S 25A BMS (Battery Management System)\u003c\/b\u003e bridges the gap between lightweight 10A boards and massive, bulky industrial controllers. Designed specifically for three-cell (3S) Lithium-Ion configurations—such as 18650 or 21700 arrays—it safely regulates a nominal 11.1V output (peaking at 12.6V). With a continuous discharge rating of 25 Amps, this board is engineered to handle the demanding electrical spikes of mid-sized DC motors, making it an exceptional choice for repairing cordless vacuums, upgrading RC vehicles, and building heavy-duty portable power stations.\u003c\/p\u003e\n\u003cp data-path-to-node=\"6\"\u003eCrucially, this specific model features integrated \u003cb data-path-to-node=\"6\" data-index-in-node=\"51\"\u003eactive cell balancing\u003c\/b\u003e. In multi-cell packs, individual batteries inevitably charge at slightly different rates. Without balancing, one cell can overcharge while another remains depleted, drastically reducing the pack's lifespan. This board actively monitors each of the three tiers independently, bleeding off excess voltage from the fastest-charging cells through precision resistors. This ensures that every single cell hits exactly 4.2V simultaneously, guaranteeing maximum runtime and preserving the chemical health of your 18650s.\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\"\u003e25A Continuous Discharge:\u003c\/b\u003e Safely sustains up to 25 Amps of continuous current (roughly 300 Watts of power) and handles brief transient spikes up to 50A, providing massive headroom for demanding inductive 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 Equalization:\u003c\/b\u003e Built-in balancing circuitry equalizes the voltage across all three series cells during the final charging phase, capturing 100% of your pack's true storage 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 Acts as a vigilant gatekeeper, instantly severing the connection in the event of over-voltage (over-charging), under-voltage (deep discharging), extreme over-current, or a hard short-circuit.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,3,0\"\u003e\u003cb data-path-to-node=\"8,3,0\" data-index-in-node=\"0\"\u003eLow Heat Generation:\u003c\/b\u003e Utilizes a bank of high-quality, ultra-low internal resistance MOSFETs to ensure minimal power loss and reduced thermal buildup during heavy operation.\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\"\u003eCompact \u0026amp; Flat Footprint:\u003c\/b\u003e Designed to slide effortlessly alongside a standard 3-cell 18650 flat-pack or triangle-pack without requiring excessive modifications to your project enclosure.\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\"\u003eCordless Vacuum Rebuilds:\u003c\/b\u003e The undisputed go-to replacement board for rebuilding or upgrading the dead 11.1V\/14.4V internal battery packs in handheld vacuums and robotic floor sweepers.\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\"\u003eHigh-Wattage Portable Audio:\u003c\/b\u003e Protects the internal lithium power supply inside custom-built, heavy-duty Bluetooth boomboxes and PA systems.\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\"\u003eMid-Sized Robotics:\u003c\/b\u003e Delivers rugged, unthrottled power to 12V-class robotic chassis utilizing multiple high-torque geared motors and heavy servos.\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\"\u003eDIY Power Banks \u0026amp; Lighting:\u003c\/b\u003e An excellent controller for custom 12V power banks designed to drive high-wattage LED floodlights, camping arrays, and amateur radio equipment.\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 3S (3 Cells in Series)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,1,0\"\u003e\u003cb data-path-to-node=\"12,1,0\" data-index-in-node=\"0\"\u003eSupported Chemistry:\u003c\/b\u003e Lithium-Ion (18650, 21700, etc.) with 3.7V nominal \/ 4.2V peak rating\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 11.1V\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 12.6V (Requires a dedicated 12.6V CC\/CV lithium 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 25A\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,5,0\"\u003e\u003cb data-path-to-node=\"12,5,0\" data-index-in-node=\"0\"\u003ePeak \/ Instantaneous Current:\u003c\/b\u003e ~50A\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\"\u003eOvercharge Protection Threshold:\u003c\/b\u003e 4.25V ±0.05V 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\"\u003eOver-Discharge Cut-off Threshold:\u003c\/b\u003e 2.5V ±0.05V per cell\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\"\u003eBalancing Current:\u003c\/b\u003e ~42mA to 50mA per cell\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,9,0\"\u003e\u003cb data-path-to-node=\"12,9,0\" data-index-in-node=\"0\"\u003eApproximate Dimensions:\u003c\/b\u003e 56 mm x 45 mm x 3 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"12,10,0\"\u003e\u003cb data-path-to-node=\"12,10,0\" data-index-in-node=\"0\"\u003eWiring Setup:\u003c\/b\u003e Separate port or Same port (Verify specific manufacturer layout via included wiring diagram)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"K-TECHNICS","offers":[{"title":"Default Title","offer_id":42858706829383,"sku":null,"price":0.0,"currency_code":"KES","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/7637\/2039\/files\/3S-25A.webp?v=1780938273","url":"https:\/\/www.ktechnics.com\/products\/3s-25a-bms-lithium-ion-battery-protection-board-with-cell-balancing-11-1v-12-6v","provider":"K-TECHNICS","version":"1.0","type":"link"}