{"product_id":"2s-7-4v-10a-lithium-battery-charge-protection-board-balancer-equalizer","title":"2S 7.4V 10A Li-ion Battery Protection Board Balancer BMS","description":"\u003ch2\u003e2S 7.4V \/ 8.4V 10A Battery Charge Protection Board with Balancer Equalizer\u003c\/h2\u003e\n\n\u003cp\u003eKeep your 2-cell lithium-ion battery packs performing at their best with this compact \u003cstrong\u003e2S Charge Protection Board with Balancer Equalizer\u003c\/strong\u003e. Designed for 7.4V (nominal) \/ 8.4V (fully charged) 2S Li-ion packs, this module provides overcharge, over-discharge, and overcurrent protection while actively balancing both charging and discharging cycles — extending battery life and maintaining consistent cell health across your pack.\u003c\/p\u003e\n\n\u003cp\u003eAt just approximately \u003cstrong\u003e47 × 24 × 4 mm\u003c\/strong\u003e, this ultra-slim PCB fits neatly into power tool battery housings, RC vehicles, DIY electronics projects, and custom battery packs without adding bulk. With a continuous current rating of \u003cstrong\u003e10A\u003c\/strong\u003e, it's built for real-world power demands.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2S Li-ion BMS:\u003c\/strong\u003e Supports 2-cell series lithium-ion \/ lithium-polymer battery configurations\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Range:\u003c\/strong\u003e 7.4V nominal \/ 8.4V fully charged\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Continuous Current:\u003c\/strong\u003e 10A charge and discharge\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActive Balancing:\u003c\/strong\u003e Balances cells during both charging and discharging for even cell wear\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProtection Functions:\u003c\/strong\u003e Overcharge, over-discharge, overcurrent, and short-circuit protection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Approx. 47 × 24 × 4 mm — easy to integrate into custom enclosures\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBroad Compatibility:\u003c\/strong\u003e Suitable for power tools, RC packs, e-bikes, DIY electronics, and more\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eUsage Tips\u003c\/h3\u003e\n\u003cp\u003eFor best results, ensure that all batteries in the pack are \u003cstrong\u003eidentical in chemistry, capacity, and internal resistance\u003c\/strong\u003e — ideally from the same production batch and at the same state of charge before assembly. This allows the balancer to operate most effectively and maximises the longevity of your battery pack.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCell Configuration:\u003c\/strong\u003e 2S (2 cells in series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Voltage:\u003c\/strong\u003e 7.4V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharge Cutoff Voltage:\u003c\/strong\u003e 8.4V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRated Current:\u003c\/strong\u003e 10A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e Approx. 47 × 24 × 4 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Chemistry:\u003c\/strong\u003e Li-ion \/ LiPo\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor further guidance on lithium battery safety and best practices, visit the U.S. Consumer Product Safety Commission (CPSC) — Lithium-Ion Battery Safety Information.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eQ: What does a 2S battery charge protection board with balancer do?\u003c\/h4\u003e\n\u003cp\u003eA: A 2S Battery Management System (BMS) protection board monitors and manages a 2-cell series lithium-ion battery pack. It prevents individual cells from being overcharged beyond 4.2V or discharged below their safe minimum, guards against overcurrent and short-circuit events, and actively balances the charge level between both cells during charging and discharging — helping maintain even cell wear and maximising overall pack lifespan.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What battery packs is this 2S 7.4V 10A protection board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This board is compatible with any 2S lithium-ion or lithium-polymer (LiPo) battery pack with a nominal voltage of 7.4V and a maximum charge voltage of 8.4V. Common applications include power tool battery packs, RC car and drone batteries, e-bike auxiliary packs, portable lighting systems, and custom DIY electronics projects drawing up to 10A continuous current.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Do I need to match the batteries before using this balancer board?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — for optimal balancing performance, it is strongly recommended to use batteries that are identical in brand, chemistry, capacity (mAh), and internal resistance. Ideally, use cells from the same production batch and ensure they are at the same state of charge before assembling the pack. Mismatched cells can reduce the effectiveness of the balancer and may shorten pack life.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How large is this protection board and how do I install it?\u003c\/h4\u003e\n\u003cp\u003eA: The board measures approximately 47 × 24 × 4 mm, making it compact enough to fit inside most battery housings and custom enclosures. Connect the B– and B+ terminals to the negative and positive ends of your cell stack respectively, and the balance wire(s) to the mid-point between cells. Always refer to the wiring diagram included with the module, and ensure connections are secure before applying load.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does a 2S battery charge protection board with balancer do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A 2S Battery Management System (BMS) protection board monitors and manages a 2-cell series lithium-ion battery pack. 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