--- product_id: 166027929 title: "KOOBOOK 10pcs 3A BMS Protection Board for 1S 3.7V 18650 Li-ion Battery | Solder Belt,Silk-Screened PCB Labels (B+,B-,P+,P-),for Building Custom Battery Packs Garden Solar Lights and on-the-go Power" brand: "koobook" price: "$15.73" currency: USD in_stock: true category: "Koobook" url: https://www.desertcart.us/products/166027929-koobook-10pcs-3a-bms-protection-board-for-1s-3-7v store_origin: US region: United States of America --- # 3.7V stable output 2A continuous current limit Multi-layer battery protection KOOBOOK 10pcs 3A BMS Protection Board for 1S 3.7V 18650 Li-ion Battery | Solder Belt,Silk-Screened PCB Labels (B+,B-,P+,P-),for Building Custom Battery Packs Garden Solar Lights and on-the-go Power **Brand:** koobook **Price:** $15.73 **Availability:** ✅ In Stock ## Summary > 🛡️ Power up with confidence — protect your battery, protect your hustle! ## Quick Answers - **What is this?** KOOBOOK 10pcs 3A BMS Protection Board for 1S 3.7V 18650 Li-ion Battery | Solder Belt,Silk-Screened PCB Labels (B+,B-,P+,P-),for Building Custom Battery Packs Garden Solar Lights and on-the-go Power by koobook - **How much does it cost?** $15.73 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/166027929-koobook-10pcs-3a-bms-protection-board-for-1s-3-7v) ## Best For - koobook enthusiasts ## Why This Product - Trusted koobook brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug & Play Efficiency:** Pre-soldered belt and clear wiring instructions make installation quick, minimizing downtime. - • **Robust Current Handling:** Supports up to 2A continuous current with 2.5A overcurrent detection for reliable power delivery. - • **Precision Voltage Control:** Overcharge cutoff at 4.23±0.05V ensures battery longevity and safety. - • **Compact & Versatile Design:** Slim 30x3.7x2.2mm board fits various 1S 18650 lithium battery configurations effortlessly. - • **Comprehensive Battery Safeguards:** Integrated overcharge, over-discharge, short circuit, and overcurrent protections keep your battery pack secure. ## Overview The KOOBOOK 10pcs 3A BMS Protection Board kit offers precise voltage regulation and multi-layer safety features tailored for 1S 3.7V 18650 lithium-ion batteries. With a compact form factor and robust 2A continuous current capacity, it ensures stable, reliable power output while safeguarding against overcharge, over-discharge, short circuits, and overcurrent. Ideal for professionals seeking dependable battery management in high-integration, cost-effective applications. ## Description Specifications: Over charge release voltage: 4.23±0.05V Over charging voltage range: 4.25±0.05V Over discharge voltage range: 2.45±0.1V Upper limit continuous current: 2A Overcurrent detection current: 2.5A Charging voltage: 4.2V IC component: DW01+8205A Size: approx.30*3.7*2.2mm Connection description: B+ connect to battery+ B- connect to battery- P+ for battery output input+ P- for battery output input- Note: Manual measurement, with small error. Please check size in detail before purchase. Real colors may slightly differ from the pictures, as it depends on specific monitor settings and light brightness. We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution. Package Includes: 10Pcs ## Features - With over charge, over discharge, short circuit, over current protection function, for a variety of different shapes of 3.N capacity lithium batteries. - Suitable for many requirements of high integration, low cost occasions. - Can meet the performance requirements of many aspects, to ensure, the absolute safety of the battery group. - Low current consumption,stable performance. - Strictly follow the diagram wiring, do not intentionally short-circuit! After the line is connected, you need to charge first, then there will be output. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07W75BQWW | | Brand | KOOBOOK | | Color | Green | | Customer Reviews | 4.4 out of 5 stars 148 Reviews | | Input Voltage | 3.7 Volts | | Item Weight | 0.01 Kilograms | | Manufacturer | KOOBOOK | | Mfr Part Number | KB457 | | Model Number | KB457 | | Number of Outlets | 10 | | Output Voltage | 3.7 Volts | | Plug Format | Type A | | Plug Type | Type A | | Power Source | rechargeable battery | | UPC | 797805999058 | | Unit Count | 10.0 Count | ## Product Details - **Brand:** KOOBOOK - **Color:** Green - **Input Voltage:** 3.7 Volts - **Item Weight:** 0.01 Kilograms - **Output Voltage:** 3.7 Volts ## Images ![KOOBOOK 10pcs 3A BMS Protection Board for 1S 3.7V 18650 Li-ion Battery | Solder Belt,Silk-Screened PCB Labels (B+,B-,P+,P-),for Building Custom Battery Packs Garden Solar Lights and on-the-go Power - Image 1](https://m.media-amazon.com/images/I/61qawjMYboL.jpg) ## Questions & Answers **Q: How do I connect these for 24 volts using 14 18650 batteries? 7 in series, 2 groups in parallel.** A: I recommend to use 3S 11.1V 12.6V 25A W/Balance 18650 Li ion Lithium Battery PCB Protection Board Know as a BMS. search for DIY 18650 battery pack **Q: What is the max input voltage? Would 5v be ok** A: 5v input should be fine. The battery will be allowed to charge till a battery measure of 4.25 is reached, then the circuit will disconnect your 5v input from the battery. ## Frequently Bought Together - KOOBOOK 10pcs 3A BMS Protection Board with Solder Belt for 1S 3.7V 18650 Li-ion Lithium Battery Cell Kit - RAKwireless WisBlock Meshtastic Starter Kit US915 Base RAK19007 + Core RAK4631 - 18650 Battery Case Holder, 4 Pcs 2 Slots x 3.7V DIY Battery Storage Box, in Parallel Black Plastic Batteries Case for 2 x 18650 Ltvystore --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/166027929-koobook-10pcs-3a-bms-protection-board-for-1s-3-7v](https://www.desertcart.us/products/166027929-koobook-10pcs-3a-bms-protection-board-for-1s-3-7v) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-28*