---
product_id: 355269613
title: "DollaTek 4S 16.8V 40A 18650 Charger PCB BMS Protection Board Li-ion Lithium Battery Charger Lipo Cell Module for Drill Motor with Balancer"
brand: "dollatek"
price: "KD 2.70"
currency: KWD
in_stock: true
reviews_count: 9
category: "Dolla Tek"
url: https://www.desertcart.com.kw/products/355269613-dollatek-4s-16-8v-40a-18650-charger-pcb-bms-protection
store_origin: KW
region: Kuwait
---

# 40A continuous discharge current 16.8V high-accuracy voltage detection Triple-layer battery protection DollaTek 4S 16.8V 40A 18650 Charger PCB BMS Protection Board Li-ion Lithium Battery Charger Lipo Cell Module for Drill Motor with Balancer

**Brand:** dollatek
**Price:** KD 2.70
**Availability:** ✅ In Stock

## Summary

> 🛠️ Charge smart, drill hard — power protection that means business!

## Quick Answers

- **What is this?** DollaTek 4S 16.8V 40A 18650 Charger PCB BMS Protection Board Li-ion Lithium Battery Charger Lipo Cell Module for Drill Motor with Balancer by dollatek
- **How much does it cost?** KD 2.70 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/355269613-dollatek-4s-16-8v-40a-18650-charger-pcb-bms-protection)

## Best For

- dollatek enthusiasts

## Why This Product

- Trusted dollatek brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Triple Safety Shield:** Overcharge, over-discharge, and overcurrent protections keep your batteries safe and durable
- • **Compact & Lightweight:** Sleek 46x60x3.4mm design at just 8.8g fits seamlessly into your power tool setup
- • **Universal Compatibility:** Works flawlessly with 3.7V lithium cells including 18650, 26650, and polymer batteries
- • **Precision Voltage Control:** High-accuracy detection ensures optimal 16.8V charging without compromise
- • **Powerhouse Current Handling:** Supports up to 40A continuous discharge for peak drill performance

## Overview

The DollaTek 4S 16.8V 40A BMS Protection Board is a compact, lightweight lithium battery management system designed for high-performance cordless drills. Featuring precise voltage detection and robust triple-layer protection against overcharge, over-discharge, and overcurrent, it supports continuous discharge currents up to 40A. Compatible with various lithium battery types including 18650 and polymer cells, this module ensures safe, efficient charging and discharging, making it an essential upgrade for professional-grade power tools.

## 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 cooling environment is not good, please reduce the load current )Continuous charge current (upper limit): 20AInternal resistance: Less than 100mΩWorking temperature:-40 ~ +50CelsiusStorage Temperature:-40 ~ +80CelsiusWeight: 8.8gSize:46 mm×60 mm×3.4mm/ 1.81″ ×2.36″×0.13″Suitable for: 1.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)2.Suitable for electric drill with starting current below 80A and power below 135W .Attention: When you wiring 0V, 4.2V, 8.4V, 12.6V, 16.8V, plese do it strictly according to the wiring diagram. Do not deliberately make it short circuit.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.When soldering the battery for the first time, do not connect any load or equipment to the output.Do not mix the good battery and poor battery to use.The internal resistance of 4 battery capacity are closer will be better.Package inlcuded: 1x 4S 40A lithium Battery Protection Board

Review: Works well - Fitted to four very large car size lithium cells, as of yet nothing has gone up in smoke so all good.
Review: Good replacement - As described.

## Features

- High-accuracy voltage detection circuit, fine workmanship and durable.
- Highlight: Over-discharge protection, overcurrent protection, overcharge protection; High charge and discharge current; Compact size and lightweight.
- Conditions for Starting the Drill: To successful starting the drill requires three 15C-20C power batteries, or six 10C-15C power batteries.
- For connecting cables, use copper wire over 3 square millimeters, the shorter the better (can not use nickel plate!!!).
- MOS transistor can control the battery charge and discharge, low standby current consumption.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B099DT6KYB |
| Best Sellers Rank | 79,832 in DIY & Tools ( See Top 100 in DIY & Tools ) 185 in Cordless Tool Chargers |
| Guaranteed software updates until | unknown |
| Item model number | ELA18767 |
| Manufacturer | DollaTek |
| Product Dimensions | 0.3 x 4.6 x 6 cm; 8.8 g |

## Product Details

- **Brand:** DollaTek
- **Colour:** green
- **Item weight:** 8.8 Grams
- **Output voltage:** 16.8 Volts (DC)
- **Product dimensions:** 3D x 46W x 60H millimetres

## Images

![DollaTek 4S 16.8V 40A 18650 Charger PCB BMS Protection Board Li-ion Lithium Battery Charger Lipo Cell Module for Drill Motor with Balancer - Image 1](https://m.media-amazon.com/images/I/71vjPtaZgKL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well
*by M***S on 2 May 2025*

Fitted to four very large car size lithium cells, as of yet nothing has gone up in smoke so all good.

### ⭐⭐⭐⭐⭐ Good replacement
*by R***. on 10 February 2025*

As described.

### ⭐⭐⭐⭐⭐ 4s bms board
*by D***Z on 24 April 2024*

Bought this bms board to revive an old battery drill (nicad) by converting to lithium it worked a treat

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**Shop now:** [https://www.desertcart.com.kw/products/355269613-dollatek-4s-16-8v-40a-18650-charger-pcb-bms-protection](https://www.desertcart.com.kw/products/355269613-dollatek-4s-16-8v-40a-18650-charger-pcb-bms-protection)

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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-02-01*