---
product_id: 92152674
title: "2Pcs 3S 11.1V 12.6V 25A W/Balance 18650 Li ion Lithium Battery PCB Protection Board"
brand: "daier"
price: "12593CFA"
currency: XOF
in_stock: true
reviews_count: 13
category: "Daier"
url: https://www.desertcart.sn/products/92152674-2pcs-3s-11-1v-12-6v-25a-w-balance-18650
store_origin: SN
region: Senegal
---

# 25A max operating current 3S 11.1V / 12.6V battery balance Short circuit & overvoltage protection 2Pcs 3S 11.1V 12.6V 25A W/Balance 18650 Li ion Lithium Battery PCB Protection Board

**Brand:** daier
**Price:** 12593CFA
**Availability:** ✅ In Stock

## Summary

> 🛠️ Power your DIY battery packs with pro-grade balance & protection!

## Quick Answers

- **What is this?** 2Pcs 3S 11.1V 12.6V 25A W/Balance 18650 Li ion Lithium Battery PCB Protection Board by daier
- **How much does it cost?** 12593CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/92152674-2pcs-3s-11-1v-12-6v-25a-w-balance-18650)

## Best For

- daier enthusiasts

## Why This Product

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

## Key Features

- • **Smart Cell Balancing:** Maintains equal charge across 3-series 18650 cells to maximize battery life and performance.
- • **Robust Current Handling:** Supports continuous 25A current with transient spikes up to 40A for demanding power needs.
- • **Precision Voltage Control:** Over-voltage cutoff at 4.25-4.35V ±0.05V ensures battery longevity and safety.
- • **Advanced Safety Mechanisms:** Integrated short circuit protection with delayed self-recovery prevents damage and fire hazards.
- • **Compact & Lightweight Design:** Slim 56x45x1.2mm PCB weighing just 12g fits seamlessly into custom battery packs.

## Overview

This 2-piece 3S 11.1V (12.6V max) Lithium-ion battery protection board offers precise over-voltage and over-discharge cutoffs, supports up to 25A continuous current with 40A transient spikes, and features smart cell balancing for 3-series 18650 cells. Designed with integrated short circuit protection and a compact PCB form factor, it’s essential for building safe, efficient, and long-lasting DIY lithium battery packs.

## Description

Product Description Features: 100% Brand New and High Quality Strictly according to the diagram wiring: 0V(B )3.7V(B1)7.4V(B2)11.1V(B+), Do not deliberately short circuit. After the line is connected, Need to charge first, then have output. When the battery is connected in series with 3 groups, Please ensure that the voltage of each battery is the same. If not same, please fill in each set of batteries and then use. Do not mix the good battery and the battery. The capacity of the battery internal resistance is closer will be better. Attention: Do not mix the good battery and poor battery to use. The internal resistance of 3 battery capacity are closer will be better. Please buyers know the professional knowledge of this module before buying. Specification: Over voltage range: 4.25 4.35v¡À0.05v Over discharge voltage range: 2.3 3.0v¡À0.05v Maximum operating current: 0 25A Maximum transient current: 34 40A Quiescent current: less than 30uA Internal resistance: less than 100m? Working temperature: 40 +50? Storage condition: 40 +80? Effective life: more than30000h Short circuit protection: Yes, delayed self recovery Size: 56mm*45mm*1.2mm(LXWXH) Material: PCB Color: Green Quantity: 1 PC Net Weight: 12g Note: Lighting, display and other factors may cause COLOR SHADING, please comprehensive pictures and text descriptions to determine! Package Includes: 2 x Battery Protection Board

Review: Need a little soldering skill but great - Worked as advertise, one failed not because of the product purely user error. mess up on my soldering
Review: Good Quality 18650 Li ion Lithium Battery protection board! - This is a 3S 12V 18650 Li-ion Lithium Battery 25A Battery management system board (BMS) which is a *must* to have if you are building your own Li-Ion battery packs. This one is needed for "over-voltage protection" of your 3S battery pack. The over voltage protection ranges between 4.25~4.35V ± 0.05V, Also, this BMS prevents over discharge of your battery pack when the individual cell group voltage ranges between: 2.3~3.0V ± 0.05V. So what does actually BMS portion of this board actually do?, Well the so called "balancing" is handled by the BMS circuitry of this board, remember your 12v battery charger sends out constant voltage & current especially if you have dumb charger. So, when the first cell group reaches full capacity, the BMS cuts off the charger and drains the highest cell group(s) slowly using its on-board resistors. Once its lower, it allows the charger to turn back on. It repeats until all cell groups are full and are at the same levels as the other groups in the (|3S|) configuration it supports. It does offer short circuit protection (The main reason why you must have this) I did try it and it worked but just because short circuit protection is there do not try to deliberately short circuit too often as it does provide up-to 25A and it does self recover after a temporary short circuit and protects the battery from overheating and catching fire when there is deliberate permanent short circuit at the output terminals. This alone is worth having this board. FYI, Just like any other DIY battery pack do's and don'ts you must adhere to rules and make sure that when the batteries are connected in series with 3 groups (|3S|) please ensure that the voltage of each battery is the same. If not the same swap out the batteries and ensure all the batteries are of same voltage in the group this will ensure better balancing operation. The life of a this DIY rechargeable battery pack using this 18650 Li ion Lithium Battery PCB Protection Board can be further extended through the use of an intelligent charging system at the battery terminals but that generally costs a lot of money. Rating the product with five stars!

## Features

- Over voltage range: 4.25-4.35v ± 0.05v; Over discharge voltage range: 2.3-3.0v ± 0.05v
- Maximum operating current: 0-25A ;Maximum transient current: 34-40A
- Wiring:(please check the picutre 3 wiring diagram)Strictly according to the diagram wiring: 0V(B )3.7V(B1)7.4V(B2)11.1V(B+), Do not deliberately short circuit. After the line is connected, Need to charge first, then have output.
- When the battery is connected in series with 3 groups, Please ensure that the voltage of each battery is the same. If not same, please fill in each set of batteries and then use. Do not mix the good battery and the battery.
- Attention: Do not mix the good battery and poor battery to use. The internal resistance of 3 battery capacity are closer will be better.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07JMY631D |
| Best Sellers Rank | #226,642 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #951 in Power Converters |
| Brand | daier |
| Color | green black |
| Customer Reviews | 4.4 out of 5 stars 714 Reviews |
| Input Voltage | 3.7 Volts |
| Item Weight | 12 Grams |
| Manufacturer | daier |
| Mfr Part Number | Z370*2 |
| Model Number | Z370*2 |
| Output Voltage | 4.35 Volts (DC) |
| Plug Format | 2 Pin |
| Plug Type | 2 Pin |
| Power Source | battery |
| Unit Count | 2.0 Count |

## Product Details

- **Brand:** daier
- **Color:** green black
- **Input Voltage:** 3.7 Volts
- **Item Weight:** 12 Grams
- **Output Voltage:** 4.35 Volts (DC)

## Images

![2Pcs 3S 11.1V 12.6V 25A W/Balance 18650 Li ion Lithium Battery PCB Protection Board - Image 1](https://m.media-amazon.com/images/I/71o3GVWmqlL.jpg)

## Questions & Answers

**Q: If a single cell drops below 2.3V will the entire battery pack be disconnected? It appears that all three cells need to drop below 2.3V.**
A: Calling this tiny board "BMS" is overkill, This is more of a simple "Battery Protection board" with little bit of so called "BMS" thingy. This BMS won't cut on discharge until at least one "cell-group" has dropped to a dangerously low voltage.. Since you see the arrangement is 3S and with 5 x 18650 in parallel, one of such cell-group developing an internal fault and dropping to a dangerous low level of 2.3 while the rest of the cells in the 3S configuration having more than 4.0 is very rare and if that ever happens, it better that the BMS disconnects that cell-group to save the other two groups. 

To answer your question: - Yes! if single cell drops below 2.3v it does have a potential for the entire battery pack to be disconnected from the output terminal by design.

**Q: One you build the battery, i assume you need a 12v dc charger. anyone have any reccomendations for chargers?**
A: find something at 12.6v - there is a company called talentcell on amazon that sells some already put together batteries using 3s 18650 cells at various parallel configs to give different capacity. They do sell their 12.6v chargers separately - but keep in mind they are designed for 3s2p or 3s3p levels of setup - i think 1 or 2 amp - so depending on how big your build is - these may not work for you. I have in the past gone with 12.6 volts and used 1 amp for every parallel set of  cells. so for a 3s5p battery i had a 12.6v 5a charger - lots of those on here too.

**Q: When using a 12v power supply to charge the battery, will the BMS automatically shut off, or can it be overcharged?**
A: For this item the max voltage that should be put into it for standard max voltage 4.2v 18650 batteries is 12.6v (4.2v x 3s). Any more than that and you risk overcharging (damaging) your batteries. For the longest life for the batteries over time 12v should be most optimal (ends up being about 8-10% under max capacity of most batteries).

**Q: What thermocouple is needed for these boards?**
A: There is no capability for temp monitoring on this board that I have seen.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Need a little soldering skill but great
*by A***R on May 18, 2026*

Worked as advertise, one failed not because of the product purely user error. mess up on my soldering

### ⭐⭐⭐⭐⭐ Good Quality 18650 Li ion Lithium Battery protection board!
*by B***S on September 16, 2019*

This is a 3S 12V 18650 Li-ion Lithium Battery 25A Battery management system board (BMS) which is a *must* to have if you are building your own Li-Ion battery packs. This one is needed for "over-voltage protection" of your 3S battery pack. The over voltage protection ranges between 4.25~4.35V ± 0.05V, Also, this BMS prevents over discharge of your battery pack when the individual cell group voltage ranges between: 2.3~3.0V ± 0.05V. So what does actually BMS portion of this board actually do?, Well the so called "balancing" is handled by the BMS circuitry of this board, remember your 12v battery charger sends out constant voltage & current especially if you have dumb charger. So, when the first cell group reaches full capacity, the BMS cuts off the charger and drains the highest cell group(s) slowly using its on-board resistors. Once its lower, it allows the charger to turn back on. It repeats until all cell groups are full and are at the same levels as the other groups in the (|3S|) configuration it supports. It does offer short circuit protection (The main reason why you must have this) I did try it and it worked but just because short circuit protection is there do not try to deliberately short circuit too often as it does provide up-to 25A and it does self recover after a temporary short circuit and protects the battery from overheating and catching fire when there is deliberate permanent short circuit at the output terminals. This alone is worth having this board. FYI, Just like any other DIY battery pack do's and don'ts you must adhere to rules and make sure that when the batteries are connected in series with 3 groups (|3S|) please ensure that the voltage of each battery is the same. If not the same swap out the batteries and ensure all the batteries are of same voltage in the group this will ensure better balancing operation. The life of a this DIY rechargeable battery pack using this 18650 Li ion Lithium Battery PCB Protection Board can be further extended through the use of an intelligent charging system at the battery terminals but that generally costs a lot of money. Rating the product with five stars!

### ⭐⭐⭐⭐ Does a good job: well balance each cell, good protection & accurate operation range (about +/-0.05v)
*by H***P on September 4, 2020*

There are 2 different DIY project for this purchased: 1st board I made it as a power bank for a low battery power laptop by using 6 lithium flat batteries (2p of 3s) to have 12v - 5200mAh. I got 0.03v different for each cells on 3s pack (photo 1) and 0.04v different for each cell on 2p of 3s pack (photo 2). After full charged, the power for all cells are not exactly equally but the board is really do great job for balancing the cell before start charging and the rang is lower than as it described (+/-0.5v). By add volt meter next to it, I do see the board stops charging when power almost reach to 4.2v for each cell and cutting off output to protect all cells when total voltage drop at 9.5v. This project helps my small laptop can last couple more hours longer than its original build in battery. 2nd board I made it as 12v charger station to charge 18650 batteries 3s pack which I try to salvage all old hand tool model that I could not find a new batteries for replacement. Because I use same board to charge for different batteries pack from 3s 1500mAh pack to 3s 2500mAh pack - of cause overloading protection function will not avail for this project as my purposed, so using volt. meter that I monitor the power balancing during batteries charging and I do see it is doing same job with good balance range about +/- 0.05v different. All my hand tool are back to working same as using its original batteries. Without this production all my hand tool is likely going to trash, my laptop runs just an hour with no AC power supply..., it is saving me a lot of money - Highly recommend this production for a small DIY job ….

## Frequently Bought Together

- 2Pcs 3S 11.1V 12.6V 25A W/Balance 18650 Li ion Lithium Battery PCB Protection Board
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*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-07-07*