---
product_id: 568742880
title: "4 pcs 3S 40A PCB Protection Board 18650 Lithium Battery Protection Board Li-ion Lithium Battery Charger PCB BMS 11.1V 12V 12.6V with Balance Charging with Nickel strip"
brand: "youmile"
price: "€ 22.50"
currency: EUR
in_stock: true
url: https://www.desertcart.fi/products/568742880-4-pcs-3s-40a-pcb-protection-board-18650-lithium-battery
store_origin: FI
region: Finland
---

# 40A max continuous discharge current Supports 3S Li-ion battery packs (11.1V - 12.6V) Multi-layer protection: overcharge, overdischarge, overcurrent, short circuit 4 pcs 3S 40A PCB Protection Board 18650 Lithium Battery Protection Board Li-ion Lithium Battery Charger PCB BMS 11.1V 12V 12.6V with Balance Charging with Nickel strip

**Brand:** youmile
**Price:** € 22.50
**Availability:** ✅ In Stock

## Summary

> 🛡️ Power up with confidence — your battery’s ultimate guardian!

## Quick Answers

- **What is this?** 4 pcs 3S 40A PCB Protection Board 18650 Lithium Battery Protection Board Li-ion Lithium Battery Charger PCB BMS 11.1V 12V 12.6V with Balance Charging with Nickel strip by youmile
- **How much does it cost?** € 22.50 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/568742880-4-pcs-3s-40a-pcb-protection-board-18650-lithium-battery)

## Best For

- youmile enthusiasts

## Why This Product

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

## Key Features

- • **Versatile Compatibility:** Works seamlessly with lithium-ion, ternary, manganese acid, and cobalt acid batteries
- • **Balance Charging Mastery:** Ensures balanced charging across all 3 cells, extending battery lifespan and reliability
- • **Precision Voltage Control:** Maintains safe charging voltage between 12.6V and 13.6V for optimal battery health
- • **Comprehensive Safety Suite:** Built-in overcharge, overdischarge, overcurrent, and short circuit protections to prevent costly failures
- • **Powerhouse Current Handling:** Handles up to 40A continuous discharge for high-performance battery packs

## Overview

The Youmile 3S 40A PCB Protection Board is a compact, high-performance battery management system designed for 11.1V lithium-ion packs. It delivers up to 40A continuous discharge current with precise voltage regulation and multi-layer safety protections including overcharge, overdischarge, overcurrent, and short circuit prevention. Featuring balance charging and broad battery chemistry compatibility, it ensures safer, longer-lasting battery operation for professional-grade applications.

## Description

4 pcs 3S 40A PCB Protection Board 18650 Lithium Battery Protection Board Li-ion Lithium Battery Charger PCB BMS 11.1V 12V 12.6V with Balance Charging with Nickel strip

## Features

- 【What it does】: The 3S 40A protection board can effectively prevent various problems encountered when charging the battery and avoid accidents.
- 【Multiple protection】: The protection board has precise overcharge protection, over discharge protection, overcurrent protection, short circuit protection and other protection functions.
- 【Current and voltage】: Charging voltage: DC 12.6V~13.6V;Continuous discharge current: maximum 40A (if the heat dissipation environment is not good, please reduce the load current);Continuous charging current: maximum 20A.
- 【Note】: Do not mix good batteries and bad batteries together, and new and old batteries can't be used together.Strictly according to the diagram wiring，0V/4.2V/8.4V/12.6V.
- 【Scope of application】: The protection board is suitable for lithium-ion batteries, and can also be used for ternary batteries, manganese acid batteries, and cobalt acid batteries.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Youmile |
| Part number | JK-YM-689 |
| Item Weight | 50 g |
| Product Dimensions | 45 x 45 x 45 cm; 50 g |
| Item model number | JK-YM-689 |
| Colour | green |
| Specification met | CE |
| Batteries included? | No |
| Batteries Required? | No |

## Product Details

- **Brand:** Youmile
- **Colour:** green
- **Output voltage:** 13.6 Volts (DC)
- **Specification met:** CE
- **Input voltage:** 13.6 Volts (DC)

## Images

![4 pcs 3S 40A PCB Protection Board 18650 Lithium Battery Protection Board Li-ion Lithium Battery Charger PCB BMS 11.1V 12V 12.6V with Balance Charging with Nickel strip - Image 1](https://m.media-amazon.com/images/I/818HcwDkeHL.jpg)

## Frequently Bought Together

- Youmile 4 pcs 3S 40A PCB Protection Board 18650 Lithium Battery Protection Board Li-ion Lithium Battery Charger PCB BMS 11.1V 12V 12.6V with Balance Charging with Nickel strip
- Aideepen 3PCS 3S 20A Li-ion Lithium Battery Charger Board PCB BMS 12.6V Cell Module Overcharge Overcurrent Short Circuit Protection
- Nickel Strip,0.15 * 27mm 10M 2P Nickel Strip for 18650 Battery Spot Welding Tape Ni Plate,Used for 2 Parallel 18650 Batteries Spot Welding DIY 18650 Battery Pack, 20.25mm Spacing

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**Shop now:** [https://www.desertcart.fi/products/568742880-4-pcs-3s-40a-pcb-protection-board-18650-lithium-battery](https://www.desertcart.fi/products/568742880-4-pcs-3s-40a-pcb-protection-board-18650-lithium-battery)

---

*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-01*