{"product_id":"4s-lithium-ion-18650-battery-balance-board-14-8v-16-8v-full-charge-balancing-circuit","title":"4S Lithium-Ion 18650 Battery Balance Board (14.8V \/ 16.8V Full Charge Balancing Circuit)","description":"\u003cp data-path-to-node=\"5\"\u003eThe \u003cb data-path-to-node=\"5\" data-index-in-node=\"4\"\u003e4S Lithium-Ion Battery Balance Board\u003c\/b\u003e is a highly specialized add-on circuit designed exclusively to equalize the voltage across four series-connected (4S) Lithium-Ion cells. While many standard, budget-friendly Battery Management Systems (BMS) offer vital over-charge and short-circuit protection, they frequently omit the crucial cell-balancing feature. This standalone module bridges that gap. It is designed to be wired in parallel with your existing standard BMS to upgrade your pack with professional-grade passive cell balancing.\u003c\/p\u003e\n\u003cp data-path-to-node=\"6\"\u003eThe board operates on a straightforward but highly effective principle: passive resistive bleeding. During the final stages of a charge cycle, it actively monitors each of the four cells. The moment any individual cell reaches the maximum capacity of 4.2V, the board activates a dedicated micro-resistor for that specific tier, bleeding off the excess energy as a tiny amount of heat. This temporarily halts that specific cell from overcharging while allowing your charger to continue pushing current to the remaining lower-voltage cells until the entire pack is perfectly synchronized at 16.8V.\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\"\u003ePrecision Voltage Equalization:\u003c\/b\u003e Ensures every cell in your 4S pack reaches exactly 4.2V, capturing 100% of your battery's true capacity and preventing localized cell degradation.\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\"\u003eUniversal Companion Module:\u003c\/b\u003e Designed to be easily retrofitted into existing battery packs. Simply solder its balance leads to the main nodes of your battery alongside your standard, non-balancing protection board.\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-Profile Footprint:\u003c\/b\u003e The incredibly thin, minimalist PCB design allows it to be easily heat-shrinked over a 4-cell 18650 array without adding unnecessary bulk to your project enclosure.\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\"\u003eHeat-Dissipating Design:\u003c\/b\u003e Utilizes large, high-quality surface-mount resistors to safely and consistently bleed excess voltage as heat during the final trickle-charge phase.\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\"\u003eBMS Upgrades:\u003c\/b\u003e The perfect companion board for upgrading a cheap, standard 4S protection BMS that lacks an integrated balancing feature.\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\"\u003eDIY Power Walls \u0026amp; Inverters:\u003c\/b\u003e An essential addition for maintaining the health of high-capacity 14.8V storage banks built from salvaged or mismatched 18650 laptop cells.\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\"\u003eCustom Robotics Power:\u003c\/b\u003e Ensures your 12V-class robotic chassis batteries deliver maximum runtime by keeping all cells perfectly matched after heavy discharge cycles.\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\"\u003ePack Repair \u0026amp; Maintenance:\u003c\/b\u003e A great bench tool for manually bringing a severely unbalanced 4S drone or RC car battery back into perfect equilibrium.\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 4S (4 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, LiPo) 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\"\u003eBalance Trigger Voltage:\u003c\/b\u003e 4.20V (± 0.03V) per cell\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\"\u003eBalance Recovery Voltage:\u003c\/b\u003e 4.19V\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\"\u003eBalancing Current:\u003c\/b\u003e ~66mA (Varies slightly by specific resistor load, typically 60-70mA)\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\"\u003eBoard Dimensions:\u003c\/b\u003e Approximately 26 mm x 20 mm x 2 mm\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\"\u003eConnection Type:\u003c\/b\u003e Solder Pads (B-, B1, B2, B3, B4)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"K-TECHNICS","offers":[{"title":"Default Title","offer_id":42857753870407,"sku":null,"price":350.0,"currency_code":"KES","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/7637\/2039\/files\/71HDmemy4cL._AC_SL1500.jpg?v=1780906981","url":"https:\/\/www.ktechnics.com\/products\/4s-lithium-ion-18650-battery-balance-board-14-8v-16-8v-full-charge-balancing-circuit","provider":"K-TECHNICS","version":"1.0","type":"link"}