---
product_id: 658414837
title: "2S 7.4V 8.4V 8A 18650 Charger PCB BMS Protection Board for Li-ion Lithium Battery Cell (5pcs)"
brand: "aceirmc"
price: "$U4069"
currency: UYU
in_stock: false
reviews_count: 4
category: "Aceirmc"
url: https://www.desertcart.uy/products/658414837-2s-7-4v-8-4v-8a-18650-charger-pcb-bms
store_origin: UY
region: Uruguay
---

# 8A max current 2S 7.4V/8.4V Li-ion support 4-layer safety protection 2S 7.4V 8.4V 8A 18650 Charger PCB BMS Protection Board for Li-ion Lithium Battery Cell (5pcs)

**Brand:** aceirmc
**Price:** $U4069
**Availability:** ❌ Out of Stock

## Summary

> 🛠️ Power up with precision — protect your pack like a pro!

## Quick Answers

- **What is this?** 2S 7.4V 8.4V 8A 18650 Charger PCB BMS Protection Board for Li-ion Lithium Battery Cell (5pcs) by aceirmc
- **How much does it cost?** $U4069 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/658414837-2s-7-4v-8-4v-8a-18650-charger-pcb-bms)

## Best For

- aceirmc enthusiasts

## Why This Product

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

## Key Features

- • **Quadruple Safety Shield:** Integrated overcharge, overdischarge, overcurrent, and short circuit protections safeguard your battery pack.
- • **Ultra-Low Standby Drain:** Consumes less than 10μA, maximizing battery life during idle periods.
- • **Compact & Durable Design:** Slim 41x8x2.2mm PCB built to last 50,000+ hours, perfect for sleek, professional battery pack builds.
- • **Precision Voltage Control:** High-accuracy detection ensures optimal 4.28V overcharge cutoff and 2.9V overdischarge protection.
- • **Powerful 8A Current Handling:** Delivers robust charging and discharging for demanding devices without overheating.

## Overview

This 2S 7.4V/8.4V 8A BMS protection board by ACEIRMC offers high-accuracy voltage management and comprehensive safety features including overcharge, overdischarge, overcurrent, and short circuit protection. Designed for lithium-ion battery packs, it supports up to 8A continuous current with ultra-low standby consumption and a durable build rated for over 50,000 hours of operation. Ideal for professional-grade DIY battery packs powering massagers, LED lights, solar street lamps, and monitoring systems.

## Description

Features:Overcharge release voltage: 4.28V+/-0.05V.Overdischarge detection voltage: 2.9V+/-0.05V.Upper operating current: 8A.Upper instantaneous current: 16A.Static current: less than 10uA.Charge voltage: 8.4V-9V.Size: 41x8x2.2mm.Packing included:2PCS.Main function:Overcharge protection, over discharge protection, short circuit protection, overcurrent protection.The described power range is applicable to the following products: massager battery pack, LED lamp standby power supply, 12V electronic products, solar street lamp battery pack, monitoring standby power supply, and other products.Wiring:B+ : Connect to battery positive.B- : Connect to battery negative.MB: Connection point between battery 1 and battery 2.P+: Positive pole for charging/discharging (common at charging/discharging end).P- : Negative pole for charging/discharging end (common at charging/discharging end).Tips: When assembling the battery pack, the battery voltage, capacity and internal resistance shall be matched. The battery voltage shall be appropriate at about 3.7v of rated voltage. If there is no output after assembling the battery pack, it can be charged at 8.4v voltage.

Review: 12/27/24: I tried non-constant-current supplies but the 8A capability of these bms’ is too much for the 3000mah Samsung 30Q batteries I’m using (which spec 1.5a nominal charge and 4a quick charge. Two in series is double the volts @ same amps so I have to limit the charge current to 4a or less and I’m choosing to set it at 3a so it can drive the pi’s and router when 12v is available.) There is no interruption in supply power when the 12v input is cut off, only a slight change in the voltage from the charger’s 9v down to the batteries 8.4v. orig: These are very small, a little over 1” long. The solder pads are very nice and quite easy to get at with a solder tip plus they take solder very nicely. The two I set up so far worked perfectly. I put them on the back side of 2x battery holders and the solder pads were perfectly positioned to take the wires from the holders tabs in straight runs. Even charging at 8a these only get slightly warm, I didn’t run them longer than maybe 10 min but if they were going to get HOT they would have by then. I’m impressed. I’m using these to make a UPS for two pi02 raspberry pi’s and a Slate router. I feed it from a constant current Drok 5a variable DC-DC converter and this works perfectly. The bms’ sense the battery voltage and apply a charge if needed automatically shutting off once the voltage rises. I am experimenting with what regulator to use to feed the battery voltage to the USB sockets for the rpi’s and the router - a cheap 3a unit may run hot at the ~2a I expect will be needed. Another Drok 5a converter would work but might be overkill. I could not be happier with these.
Review: So far these are great little protection boards. No problems at all. Easy to solder to.

## Features

- HIGH-ACCURACY, HIGHLY DURABLE: High-accuracy voltage detection circuit, fine workmanship and durable, Effective life greater than 50000 hours.
- Use for variety of capacities and various shapes 3.7V lithium batteries,Massager battery pack, LED light backup power supply, solar street light battery pack, monitor standby power supply, etc.
- Over-discharge protection, overcurrent protection, overcharge protection, short circuit protection; A combination of 4 safety features that work together to provide ultimate protection for your devices.
- MOS transistor can control the battery charge and discharge, low standby current consumption.
- ATTENTION: Strictly according to the diagram wiring: B+: Battery V+ Positive, B-: Battery V- Negative, P+: Output / Charging V+, P-: Output / Charging V-, MB: The connection point between the batteries.Otherwise it will cause damage to the chip. 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 | B08HHY5YNY |
| Battery cell composition | Lithium Ion |
| Brand | ACEIRMC |
| Charging Time | 50000 Hours |
| Country of Origin | USA |
| Customer Reviews | 4.4 4.4 out of 5 stars (12) |
| Date First Available | 25 July 2023 |
| Item Dimensions LxWxH | 2 x 41 x 2 Millimeters |
| Item Weight | 8 g |
| Manufacturer | ACEIRMC |
| Product Dimensions | 0.22 x 4.1 x 0.22 cm; 8 g |

## Product Details

- **Brand:** ACEIRMC
- **Colour:** 5PCS
- **Output Voltage:** 8.4 Volts (DC)
- **Product Dimensions:** 2D x 41W x 2H Millimeters
- **Specification Met:** CE

## Images

![2S 7.4V 8.4V 8A 18650 Charger PCB BMS Protection Board for Li-ion Lithium Battery Cell (5pcs) - Image 1](https://m.media-amazon.com/images/I/31SAG4lLQyL.jpg)
![2S 7.4V 8.4V 8A 18650 Charger PCB BMS Protection Board for Li-ion Lithium Battery Cell (5pcs) - Image 2](https://m.media-amazon.com/images/I/41+SYbNxiyL.jpg)
![2S 7.4V 8.4V 8A 18650 Charger PCB BMS Protection Board for Li-ion Lithium Battery Cell (5pcs) - Image 3](https://m.media-amazon.com/images/I/414MqBqOssL.jpg)
![2S 7.4V 8.4V 8A 18650 Charger PCB BMS Protection Board for Li-ion Lithium Battery Cell (5pcs) - Image 4](https://m.media-amazon.com/images/I/41KwDUZUi7L.jpg)
![2S 7.4V 8.4V 8A 18650 Charger PCB BMS Protection Board for Li-ion Lithium Battery Cell (5pcs) - Image 5](https://m.media-amazon.com/images/I/41x+scOKssL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by P***R on 23 December 2024*

12/27/24: I tried non-constant-current supplies but the 8A capability of these bms’ is too much for the 3000mah Samsung 30Q batteries I’m using (which spec 1.5a nominal charge and 4a quick charge. Two in series is double the volts @ same amps so I have to limit the charge current to 4a or less and I’m choosing to set it at 3a so it can drive the pi’s and router when 12v is available.) There is no interruption in supply power when the 12v input is cut off, only a slight change in the voltage from the charger’s 9v down to the batteries 8.4v. orig: These are very small, a little over 1” long. The solder pads are very nice and quite easy to get at with a solder tip plus they take solder very nicely. The two I set up so far worked perfectly. I put them on the back side of 2x battery holders and the solder pads were perfectly positioned to take the wires from the holders tabs in straight runs. Even charging at 8a these only get slightly warm, I didn’t run them longer than maybe 10 min but if they were going to get HOT they would have by then. I’m impressed. I’m using these to make a UPS for two pi02 raspberry pi’s and a Slate router. I feed it from a constant current Drok 5a variable DC-DC converter and this works perfectly. The bms’ sense the battery voltage and apply a charge if needed automatically shutting off once the voltage rises. I am experimenting with what regulator to use to feed the battery voltage to the USB sockets for the rpi’s and the router - a cheap 3a unit may run hot at the ~2a I expect will be needed. Another Drok 5a converter would work but might be overkill. I could not be happier with these.

### ⭐⭐⭐⭐⭐ Review
*by M***R on 5 June 2025*

So far these are great little protection boards. No problems at all. Easy to solder to.

### ⭐ Review
*by D***H on 20 January 2025*

I made two 2S battery packs using these for a 8V hand vacuum. Neither of the packs worked even though I had known good batteries. I gave up and deleted the BMS altogether. I know that has consequences but I only charge for short periods and I am careful to monitor charging. Vac works fine w/o the BMS.

## Frequently Bought Together

- ACEIRMC 2S 7.4V 8.4V 8A 18650 Charger PCB BMS Protection Board for Li-ion Lithium Battery Cell (5pcs)
- Comidox 3S 12V 10A 18650 Lithium Battery Protection Board BMS Li-ion Charger Protection Module Anti-Overcharge/Over-Discharge/Over-Current/Short Circuit 3Pcs

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*Product available on Desertcart Uruguay*
*Store origin: UY*
*Last updated: 2026-02-25*