{"product_id":"4s-20a-bms-li-ion-battery-protection-board-hx-4s-d20","title":"4S 20A BMS Li-ion Battery Protection Board HX-4S-D20","description":"\u003ch2\u003e4S 20A BMS Li-ion Battery Protection Board HX-4S-D20\u003c\/h2\u003e\n\u003cp\u003eThe HX-4S-D20 is a high-quality 4-series lithium-ion battery protection board (BMS) designed to safeguard your 14.8V battery packs from overcharge, over-discharge, and overcurrent. Whether you're building a DIY power bank, e-bike battery, or robotics power system, this compact BMS delivers reliable protection with a 20A continuous current rating.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e4S configuration: supports 4 series-connected Li-ion\/LiPo cells\u003c\/li\u003e\n\u003cli\u003eNominal voltage: 14.8V (supports 3.7V, 7.4V, 11.1V cell taps)\u003c\/li\u003e\n\u003cli\u003eContinuous discharge current: 20A\u003c\/li\u003e\n\u003cli\u003eOvercharge protection per cell\u003c\/li\u003e\n\u003cli\u003eOver-discharge protection per cell\u003c\/li\u003e\n\u003cli\u003eOvercurrent and short-circuit protection\u003c\/li\u003e\n\u003cli\u003eBalance taps: B1, B2, B3 for cell voltage monitoring\u003c\/li\u003e\n\u003cli\u003eOutput terminals: P+ and P- for load connection\u003c\/li\u003e\n\u003cli\u003eCompact square PCB with rounded corners for easy integration\u003c\/li\u003e\n\u003cli\u003ePCB revision: REV 1.1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eModel: HX-4S-D20\u003c\/li\u003e\n\u003cli\u003eCell configuration: 4S (4 series)\u003c\/li\u003e\n\u003cli\u003eNominal pack voltage: 14.8V\u003c\/li\u003e\n\u003cli\u003eMax continuous current: 20A\u003c\/li\u003e\n\u003cli\u003eOvercharge voltage: ~4.25V per cell\u003c\/li\u003e\n\u003cli\u003eOver-discharge voltage: ~2.5V per cell\u003c\/li\u003e\n\u003cli\u003ePCB color: Green\u003c\/li\u003e\n\u003cli\u003eMOSFETs: D403 (x4)Applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003eDIY 14.8V lithium battery packs\u003c\/li\u003e\n\u003cli\u003eE-bike and electric scooter batteries\u003c\/li\u003e\n\u003cli\u003eRobotics and drone power systems\u003c\/li\u003e\n\u003cli\u003eSolar energy storage\u003c\/li\u003e\n\u003cli\u003ePower tool battery replacements \u003c\/li\u003e\n\u003cli\u003e📦 For more details, see our \u003ca rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/lahorestore.pk\/policies\/shipping-policy\"\u003eShipping Policy\u003cspan class=\"ms-0.5 inline-block align-middle leading-none\"\u003e\u003csvg width=\"20\" height=\"20\" viewbox=\"0 0 20 20\" fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"block h-[0.75em] w-[0.75em] stroke-current stroke-[0.75]\"\u003e\u003cpath d=\"M14.3349 13.3301V6.60645L5.47065 15.4707C5.21095 15.7304 4.78895 15.7304 4.52925 15.4707C4.26955 15.211 4.26955 14.789 4.52925 14.5293L13.3935 5.66504H6.66011C6.29284 5.66504 5.99507 5.36727 5.99507 5C5.99507 4.63273 6.29284 4.33496 6.66011 4.33496H14.9999L15.1337 4.34863C15.4369 4.41057 15.665 4.67857 15.665 5V13.3301C15.6649 13.6973 15.3672 13.9951 14.9999 13.9951C14.6327 13.9951 14.335 13.6973 14.3349 13.3301Z\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/a\u003e\u003cbr\u003e📦 For more details, see our \u003ca rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/lahorestore.pk\/policies\/refund-policy\"\u003eReturn \u0026amp; Refund Policy\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lahore Store","offers":[{"title":"Default Title","offer_id":55759291351113,"sku":"HX-4S-D20","price":330.0,"currency_code":"PKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0946\/9090\/2089\/files\/WhatsApp_Image_2026-06-22_at_8.52.28_PM_1.jpg?v=1782222926","url":"https:\/\/lahorestore.pk\/products\/4s-20a-bms-li-ion-battery-protection-board-hx-4s-d20","provider":"Lahore Store","version":"1.0","type":"link"}