---
product_id: 369297812
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: "€ 32.41"
currency: EUR
in_stock: true
reviews_count: 5
category: "Atnsinc"
url: https://www.desertcart.de/products/369297812-2pack-enhanced-4s-40a-16-8v-li-ion-lithium-battery
store_origin: DE
region: Germany
---

# 40A continuous discharge current 16.8V max charging voltage Multi-layer battery protection 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:** € 32.41
**Availability:** ✅ In Stock

## Summary

> 🛠️ Charge smart, drill hard — protect your power like a pro!

## 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?** € 32.41 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/369297812-2pack-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

- • **Versatile Compatibility:** Works seamlessly with 4S lithium battery packs including 18650, 26650, and polymer cells.
- • **Precision Voltage Control:** High-accuracy voltage detection ensures safe charging and discharging cycles.
- • **Powerhouse Current Handling:** Supports up to 40A continuous discharge for high-demand tools and motors.
- • **Compact & Lightweight Design:** Easy to integrate into tight spaces without adding bulk or weight.
- • **Comprehensive Battery Defense:** Built-in overcharge, over-discharge, and overcurrent protections safeguard your investment.

## Overview

This 2-pack 4S 40A Li-ion Battery Protection Board offers robust, precise battery management with high current capacity and multi-layer safety features. Designed for lithium battery packs up to 16.8V, it ensures stable performance and longevity for power tools, motorcycles, and electric drills, all in a compact, lightweight form factor.

## Description

Specifications: Charging voltage:16.8v ~ 18.1vOver Charge voltage:4.25±0.05vOver Discharge voltage: 2.5v±0.05vContinuous discharge current (upper limit): 40A (if the heat dissipation environment is not good, please reduce the load current )Continuous charge current (upper limit): 20AInternal resistance: Less than 100mΩApplications: 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 .Note: 1.Do not deliberately make it short circuit.Please strictly according to the diagram wiring to avoid possible damage to the chip. (Connect wires refer to the "wiring diagram"(NO.5 picture).2.When the battery for the first time, do not connect any load or equipment to the output.After connection, it need to charge activation first, then will have the output.3.Do not mix good batteries with bad ones.4.The closer the internal resistance of the 4 battery capacities is the better.5.When using a brush motor type load, try to connect a non-polar capacitor (withstand voltage above 25V, capacity 10uF-100uF) in parallel with the positive and negative terminals of the motor to prevent the reverse spike voltage generated by the motor from interfering with the protection board or breakdown of the MOS tube.Package inlcudes: 2x 4S 40A lithium Battery Protection Board

Review: 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: Needs better instruction on how to connect it up. Made mistakes and blew two boards. Seems to work okay when connected properly.

## 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 |
| Item model number | 19075 |
| Manufacturer | Atnsinc |
| Product Dimensions | 20 x 20 x 15 cm; 20 g |

## Product Details

- **Brand:** Atnsinc
- **Colour:** 4S 40A
- **Item weight:** 0.02 Kilograms
- **Output voltage:** 16.8 Volts
- **Specification met:** UL, FCC

## 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/711g+-5343L.jpg)
![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 2](https://m.media-amazon.com/images/I/71I3ie7E6vL.jpg)
![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 3](https://m.media-amazon.com/images/I/71KQ7XDIPCL.jpg)
![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 4](https://m.media-amazon.com/images/I/71iHoLSkPpL.jpg)
![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 5](https://m.media-amazon.com/images/I/71nyhxpR+pL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by B***R on 6 July 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.

### ⭐⭐⭐⭐ Review
*by W***E on 17 April 2023*

Needs better instruction on how to connect it up. Made mistakes and blew two boards. Seems to work okay when connected properly.

### ⭐⭐⭐⭐⭐ Review
*by T***L on 11 November 2021*

Exceptional value and service. Thank you

## Frequently Bought Together

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*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-02-04*