{"product_id":"bms-4s-lifepo4-balancer","title":"B04S003-L4S-5A 4S 5A LiFePO4\/Li-ion Active Balancer Battery Accessories for JBD 4S Smart BMS","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eThe B04S003-L4S-5A is an \u003cstrong\u003eactive balancer\u003c\/strong\u003e in the \u003cstrong\u003eBattery Accessories\u003c\/strong\u003e category, designed for \u003cstrong\u003e4S\u003c\/strong\u003e LiFePO4 \/ Li-ion battery packs. It supports \u003cstrong\u003e5A\u003c\/strong\u003e active balancing (energy transfer between adjacent cells) to help equalize cell voltage until balance is achieved. It is described as compatible with \u003cstrong\u003eall JBD 4S Smart BMS\u003c\/strong\u003e.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eActive balance current:\u003c\/strong\u003e 5A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4S support:\u003c\/strong\u003e for 4-series battery packs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy-transfer balancing:\u003c\/strong\u003e voltage balance through energy transfer between adjacent battery cells; starts when cell voltage triggers active equalization and stops when balanced\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClaimed balancing accuracy:\u003c\/strong\u003e can be equalized to within \u003cstrong\u003e10 mV\u003c\/strong\u003e difference\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e24-hour balancing:\u003c\/strong\u003e described as 5A high current, 24-hour uninterrupted balance; stated as 5x the normal balanced current of 1A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardware design notes:\u003c\/strong\u003e high quality capacitors; open heat dissipation design; reserved fixing screw positioning holes; snap-on cable interface designed to prevent reverse plugging and loosening\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eFor product selection and wiring assistance, contact customer support at \u003ca href=\"https:\/\/tsolar.top\/\" rel=\"noopener\" target=\"_blank\"\u003ehttps:\/\/tsolar.top\/\u003c\/a\u003e or \u003ca href=\"mailto:service@tsolar.top\"\u003eservice@tsolar.top\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eActive Balancer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBattery Accessories\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eB04S003-L4S-5A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStrings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eActive balance current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSize\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e70mm*56mm*21mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePCB marking (as shown)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eB04S003 V1.0; Size: 70*56mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eWiring Diagram \u0026amp; Terminals\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalance terminals (labeled):\u003c\/strong\u003e B-, B1, B2, B3, B4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOther labeled pins:\u003c\/strong\u003e VBN, GND\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitch label:\u003c\/strong\u003e SW\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e4S lithium battery packs used in start power systems\u003c\/li\u003e\n\u003cli\u003ePortable power systems\u003c\/li\u003e\n\u003cli\u003eESS battery systems\u003c\/li\u003e\n\u003cli\u003eElectric motorcycles\u003c\/li\u003e\n\u003cli\u003eLow-speed vehicles\u003c\/li\u003e\n\u003cli\u003eSightseeing buses\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2 id=\"details\"\u003eDetails\u003c\/h2\u003e\u003cdiv class=\"details-gallery\"\u003e\n\u003cimg alt=\"OEM\/ODM and in‑stock battery management boards and modules banner with multiple PCB products\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion.webp?v=1780549237\"\u003e\u003cp\u003eOEM\/ODM supply and ready-to-ship inventory are available for battery management accessories.\u003c\/p\u003e\n\u003cimg alt=\"B04S003-L4S-5A 4S 5A active balancer wiring layout with terminals B-, B1, B2, B3, B4 and SW\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_beecd98f-55b4-478f-8783-987e1a1a553a.webp?v=1780549246\"\u003e\u003cp\u003eConnect B-, B1–B4 in order to the 4-series pack for correct active balancing and polarity protection.\u003c\/p\u003e\n\u003cimg alt=\"Active balancer PCB close-up highlighting high-capacity capacitors and component layout\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_05ec34cc-2cc2-4193-846f-2bd6d7dbf53a.webp?v=1780549254\"\u003e\u003cp\u003eHigh-quality capacitors support stable energy-transfer balancing under continuous use.\u003c\/p\u003e\n\u003cimg alt=\"B04S003 active balancer board with open heat-dissipation design and airflow illustration\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_dd0d5da6-4550-4975-9761-d9986db54989.webp?v=1780549262\"\u003e\u003cp\u003eAn open PCB layout helps dissipate heat during 5A balancing.\u003c\/p\u003e\n\u003cimg alt=\"B04S003 V1.0 balancer board front view with four reserved fixing screw positioning holes marked\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_1f5ab61b-1af0-459c-b183-b1c79a233213.webp?v=1780549270\"\u003e\u003cp\u003eReserved mounting holes make it easier to secure the balancer inside a battery enclosure.\u003c\/p\u003e\n\u003cimg alt=\"Snap-on cable connector detail on the balancer board labeled B4 B3 B2 B1 B- with fool-proof design\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_5624f5b9-f737-4364-988a-0110b6cc4d8f.webp?v=1780549280\"\u003e\u003cp\u003eA snap-on connector reduces the risk of reverse plugging and loosening from vibration.\u003c\/p\u003e\n\u003cimg alt=\"Application icons for start power, portable power, ESS battery, electric motorcycle, low-speed vehicle and bus\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_4b8cd99f-8c53-4940-a2b5-67ce4e610fa8.webp?v=1780549292\"\u003e\u003cp\u003eDesigned for common 4S lithium pack applications, from portable power to light electric vehicles.\u003c\/p\u003e\n\u003cimg alt=\"Intelligent active balancer illustration mounted on a 4-cell battery pack, transferring energy between cells\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_7b07c32d-e25e-46a6-99af-b18ce2eebe68.webp?v=1780549300\"\u003e\u003cp\u003eActive balancing transfers energy between adjacent cells when voltage differences trigger equalization.\u003c\/p\u003e\n\u003cimg alt=\"Before-and-after voltage balancing graphic for a battery pack, comparing inconsistent vs consistent cells\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_0969ebeb-dced-46e3-8aaa-22b666a2f545.webp?v=1780549311\"\u003e\u003cp\u003eBalancing helps bring cell voltages closer together for more consistent charging and discharging.\u003c\/p\u003e\n\u003cimg alt=\"Energy-transfer balance benefits panel noting efficiency, safety and intelligent 5A 24-hour balancing features\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_7ea6292b-d08f-49e0-bfbc-e93206d9e704.webp?v=1780549318\"\u003e\u003cp\u003e5A energy-transfer balancing is intended to reduce cell-to-cell differences and support long-term pack health.\u003c\/p\u003e\n\u003cimg alt=\"Certificate collage including RoHS, ISO9001, SGS, test report, software copyright and invention patent pages\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_27cf7cb9-1e05-41ea-a359-543b3b1b628e.webp?v=1780549324\"\u003e\u003cp\u003eCompliance and quality documentation may be available on request depending on the production batch.\u003c\/p\u003e\n\u003cimg alt=\"Equipment display board with production machines list and factory process photos for electronics assembly\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_07a71bd6-73fd-419a-ac81-3ac1b2a4a373.webp?v=1780549335\"\u003e\u003cp\u003eAutomated production and test equipment support consistent assembly for PCB modules.\u003c\/p\u003e\n\u003cimg alt=\"Payment methods and packaging\/shipping montage with warehouse cartons and sea\/air freight visuals\" loading=\"lazy\" src=\"https:\/\/tsolar.top\/cdn\/shop\/files\/BMS-B04S003-L4S-5A-4S-5A-LiFePO4-Active-Balancer-Li-ion_bb028582-0735-4a2d-be11-98d951ceb318.webp?v=1780549342\"\u003e\u003cp\u003eMultiple payment options and standard export packaging support worldwide shipping.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"JBD","offers":[{"title":"JBD-B04S003-LFP-4S-5A-B","offer_id":52340177404178,"sku":"jbd-16065560601553094676042470-1","price":23.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0863\/2860\/6994\/files\/20_a9aa5ea9-39f1-47df-bd97-0ebd791f0d5b.jpg?v=1780504999","url":"https:\/\/tsolar.top\/products\/bms-4s-lifepo4-balancer","provider":"TSolar","version":"1.0","type":"link"}