--- product_id: 257656207 title: "2Pack Enhanced 4S 40A 16.8V Li-ion Lithium Battery Protection Board PCB BMS Charger Protection Circuit Balance Charging Module for Drill Motor Motorcycle Battery (4S 40A)" brand: "atnsinc" price: "£9.71" currency: GBP in_stock: true reviews_count: 9 category: "Atnsinc" url: https://www.desertcart.co.uk/products/257656207-2pack-enhanced-4s-40a-16-8v-li-ion-lithium-battery store_origin: GB region: United Kingdom --- # 40A Current Rating Compact & Lightweight 16.8V Output Voltage 2Pack Enhanced 4S 40A 16.8V Li-ion Lithium Battery Protection Board PCB BMS Charger Protection Circuit Balance Charging Module for Drill Motor Motorcycle Battery (4S 40A) **Brand:** atnsinc **Price:** £9.71 **Availability:** ✅ In Stock ## Summary > 🔋 Power Up Your Projects with Confidence! ## Quick Answers - **What is this?** 2Pack Enhanced 4S 40A 16.8V Li-ion Lithium Battery Protection Board PCB BMS Charger Protection Circuit Balance Charging Module for Drill Motor Motorcycle Battery (4S 40A) by atnsinc - **How much does it cost?** £9.71 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/257656207-2pack-enhanced-4s-40a-16-8v-li-ion-lithium-battery) ## Best For - atnsinc enthusiasts ## Why This Product - Trusted atnsinc brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **📦 Durable Design:** Crafted with fine workmanship for long-lasting stability and reliability. - • **🌱 Low Standby Current:** Save energy with a MOS transistor that minimizes standby current consumption. - • **🔒 Multiple Protections:** Experience peace of mind with over-discharge, overcurrent, and overcharge safeguards. - • **🔧 Versatile Applications:** Perfect for various lithium batteries and electric drills with specific power requirements. - • **⚙️ High-Accuracy Circuit:** Enjoy precision with a high-accuracy voltage detection circuit for optimal performance. ## Overview The 2Pack Enhanced 4S 40A Li-ion Battery Protection Board is a high-quality, compact charging module designed for lithium batteries. It features multiple safety protections, a high-accuracy voltage detection circuit, and is suitable for various applications, including electric drills. With a low standby current and durable design, this PCB BMS Charger ensures stable performance for all your power needs. ## Description Buy 2Pack Enhanced 4S 40A 16.8V Li-ion Lithium Battery Protection Board PCB BMS Charger Protection Circuit Balance Charging Module for Drill Motor Motorcycle Battery (4S 40A): Power Converters - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Works well - Works well, used 4 x 18650 li-ion cells together for a drill. The two boards were connected together on arrival but easily split apart by bending slightly. Installed in my drill and charged up to full power. Tested the drill, it works fine, have not used it for any projects yet though. Will update review if have any problems. Review: You guys are great - Exceptional value and service. Thank you ## Features - High Quality; Compact size and lightweight;High-accuracy voltage detection circuit; fine workmanship and durable; stable performance. - Multiple Protections: Over-discharge protection, overcurrent protection, overcharge protection; High charge and discharge current - LOW STANDBY CURRENT: MOS transistor can control the battery charge and discharge, low standby current consumption. - Applications:It is suitable for lithium batteries with nominal voltage of 3.7V and full voltage of 4.2V (including 18650, 26650, polymer lithium batteries, no size limit).Besides, it can use for electric drill with starting current below 80A and power below 135W . - If you want to start the drill successfully, it requires 3pcs15C-20C power batteries, or 6pcs10C-15C power batteries (Note: ordinary 18650 battery can not start the drill!! Recommended power battery models: VTC4, VTC4A, VTC5A, VTC6). About connecting cables, we suggest using more than 3 square millimeters copper wire. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08NJTS9DV | | Amperage | 40 Amps | | Best Sellers Rank | #198,911 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #811 in Power Converters | | Brand | ATNSINC | | Color | 4S 40A | | Current Rating | 40 Amps | | Customer Reviews | 4.1 4.1 out of 5 stars (85) | | Input Voltage | 240 Volts | | Item Weight | 0.02 Kilograms | | Manufacturer | Atnsinc | | Mfr Part Number | 19075 | | Model Number | 19075 | | Number of Ports | 2 | | Output Voltage | 16.8 Volts (DC) | | UPC | 701715452138 | ## Product Details - **Brand:** ATNSINC - **Color:** 4S 40A - **Input Voltage:** 240 Volts - **Item Weight:** 0.02 Kilograms - **Output Voltage:** 16.8 Volts (DC) ## Images ![2Pack Enhanced 4S 40A 16.8V Li-ion Lithium Battery Protection Board PCB BMS Charger Protection Circuit Balance Charging Module for Drill Motor Motorcycle Battery (4S 40A) - Image 1](https://m.media-amazon.com/images/I/81dmucJUzdL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works well *by B***R on July 6, 2022* Works well, used 4 x 18650 li-ion cells together for a drill. The two boards were connected together on arrival but easily split apart by bending slightly. Installed in my drill and charged up to full power. Tested the drill, it works fine, have not used it for any projects yet though. Will update review if have any problems. ### ⭐⭐⭐⭐⭐ You guys are great *by T***L on November 11, 2021* Exceptional value and service. Thank you ### ⭐⭐⭐⭐ good less expensive BMS *by W***E on April 17, 2023* Needs better instruction on how to connect it up. Made mistakes and blew two boards. Seems to work okay when connected properly. ## Frequently Bought Together - 2Pack Enhanced 4S 40A 16.8V Li-ion Lithium Battery Protection Board PCB BMS Charger Protection Circuit Balance Charging Module for Drill Motor Motorcycle Battery (4S 40A) - 2Pcs 3S 11.1V 12.6V 25A W/Balance 18650 Li ion Lithium Battery PCB Protection Board - SHONAN Pure Nickel Strip 99.6% Nickel, 2 Inches Nickel Strips, 0.15x6x50mm Soldering Tabs for High Capacity 18650 Lithium Battery Pack, Li-Po, NiMh and NiCd Battery Pack and Spot Welding, 50 Pcs --- ## 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.co.uk/products/257656207-2pack-enhanced-4s-40a-16-8v-li-ion-lithium-battery](https://www.desertcart.co.uk/products/257656207-2pack-enhanced-4s-40a-16-8v-li-ion-lithium-battery) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-24*