{"product_id":"4s-14-8v-30a-li-ion-bms-protection-board-cell-balancing-18650","title":"4S 14.8V 30A Li-ion BMS Protection Board with Cell Balancing — 18650 Battery Pack","description":"\u003ch2\u003e4S 14.8V 30A Li-ion BMS Protection Board with Cell Balancing — 18650 Battery Pack\u003c\/h2\u003e\u003cp\u003eThis \u003cstrong\u003e4S 30A BMS protection board\u003c\/strong\u003e provides comprehensive protection and passive cell balancing for 4-cell series Li-ion battery packs at 14.8V nominal (16.8V fully charged). With a 30A continuous discharge rating and built-in balancing, it is designed for power tools, e-bike auxiliary packs, robotics, and high-current DIY battery applications.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eConfiguration\u003c\/td\u003e\n\u003ctd\u003e4S (4 cells in series)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Voltage\u003c\/td\u003e\n\u003ctd\u003e14.8V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFull Charge Voltage\u003c\/td\u003e\n\u003ctd\u003e16.8V (4.2V per cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContinuous Discharge Current\u003c\/td\u003e\n\u003ctd\u003e30A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOvercharge Protection\u003c\/td\u003e\n\u003ctd\u003e4.25V ±0.05V per cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOver-Discharge Protection\u003c\/td\u003e\n\u003ctd\u003e2.5V ±0.1V per cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCell Balancing\u003c\/td\u003e\n\u003ctd\u003eYes (passive balancing)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-30°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Cells\u003c\/td\u003e\n\u003ctd\u003e18650, 26650, Li-ion pouch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eWhy Choose This 4S BMS?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e✅ \u003cstrong\u003e30A continuous rating\u003c\/strong\u003e — handles power tool motors and high-drain loads\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eCell balancing included\u003c\/strong\u003e — equalizes cell voltages for longer pack lifespan\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003eFull protection suite\u003c\/strong\u003e — overcharge, overdischarge, overcurrent, short circuit\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e14.8V \/ 16.8V system\u003c\/strong\u003e — compatible with 14.4V–18V power tool voltage range\u003c\/li\u003e\n\u003cli\u003e✅ \u003cstrong\u003e-30°C to +80°C\u003c\/strong\u003e — reliable in cold and hot environments\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDIY 4S 18650 power tool battery pack (14.4V–16.8V)\u003c\/li\u003e\n\u003cli\u003eE-bike auxiliary battery protection\u003c\/li\u003e\n\u003cli\u003eRobotics and heavy-duty motor drive battery\u003c\/li\u003e\n\u003cli\u003eRC vehicle high-voltage Li-ion pack\u003c\/li\u003e\n\u003cli\u003ePortable power station 14.8V module\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e1 × 4S 14.8V 30A Li-ion BMS Protection Board with Cell Balancing\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991433793771,"sku":"\u003cnone\u003e","price":8.44,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/4s-14-8v-30a-li-ion-battery-bms-protection-board-balancing-18650.webp?v=1761881643","url":"https:\/\/keszoox.com\/products\/4s-14-8v-30a-li-ion-bms-protection-board-cell-balancing-18650","provider":"Keszoox","version":"1.0","type":"link"}