Name: BMS 5S (21V 15A ) Lithium Battery Protection Module ( Balanced ) - Electra Store
SKU: RE-22348
Price: 150.00 EGP
Availability: InStock

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BMS 5S (21V 15A ) Lithium Battery Protection Module ( Balanced )

150.00 EGP

BMS 5S 21V 15A Lithium Battery Protection Module with Balancing | 5 Cell Li-ion BMS Board

SKU: RE-22348 Category: UNI-T

Description
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Description

BMS 5S (21V 15A) Lithium Battery Protection Module with Balancing

The BMS 5S (21V 15A) Lithium Battery Protection Module (Balanced) is a high-performance battery management solution designed specifically for 5-cell lithium-ion (Li-ion) or lithium-polymer (Li-Po) battery packs. Engineered for safety, stability, and long battery life, this protection board ensures your 21V battery pack operates efficiently under various load conditions while maintaining optimal cell balance.

Whether you’re building a DIY power tool battery pack, electric scooter battery, solar energy storage system, or a portable backup power supply, this 5S 15A BMS provides comprehensive protection against overcharge, over-discharge, overcurrent, short circuit, and cell imbalance.

🔋 What is a 5S 21V Lithium BMS?

A 5S BMS (Battery Management System) is designed to manage five lithium cells connected in series. Each lithium-ion cell typically has:

Nominal voltage: 3.7V
Fully charged voltage: 4.2V

So for 5 cells:

Nominal pack voltage: 18.5V
Fully charged voltage: 21V (5 × 4.2V)

This BMS supports a maximum continuous discharge current of 15A, making it suitable for medium-power applications.

⚙️ Key Features of the 5S 21V 15A BMS (Balanced)

✅ 1. Advanced Cell Balancing Technology

This module features built-in balancing functionality, ensuring that all five cells maintain equal voltage levels during charging. Balanced cells:

Improve battery lifespan
Prevent premature cell failure
Increase overall pack efficiency
Reduce overheating risk

Balancing helps avoid voltage drift between cells, which is a common cause of battery degradation.

✅ 2. Multiple Protection Functions

The protection board includes intelligent safety mechanisms:

Overcharge Protection
Automatically disconnects charging when any cell reaches 4.2V (approx).
Over-Discharge Protection
Cuts off output when voltage drops below safe levels (around 2.7–3.0V per cell).
Overcurrent Protection (15A Continuous)
Prevents excessive current draw that may damage cells.
Short Circuit Protection
Instantly disconnects the battery during short circuit conditions.
Temperature Stability
Designed with heat-resistant components for safe operation.

✅ 3. High Current Handling (15A Continuous)

With a 15A continuous discharge rating, this BMS is ideal for:

Electric drills
Electric scooters
LED lighting systems
Robotics projects
Solar battery packs
DIY lithium battery banks

✅ 4. High-Quality MOSFET Design

The module uses low-resistance MOSFETs for efficient power flow and minimal heat generation, ensuring:

Lower internal resistance
Reduced energy loss
Higher efficiency
Better performance under load

✅ 5. Compact and Easy to Install

Designed with clearly marked:

B+ (Battery positive)
B- (Battery negative)
B1, B2, B3, B4 (Cell connections)
P+ and P- (Output terminals)

This makes installation straightforward for both professionals and DIY users.

📊 Technical Specifications

Specification	Details
Model	5S 21V Lithium BMS
Battery Type	Lithium-ion / Lithium-polymer
Number of Cells	5 Cells in Series (5S)
Nominal Voltage	18.5V
Full Charge Voltage	21V
Continuous Discharge Current	15A
Peak Current	25A (Short duration)
Overcharge Protection	4.2V ± 0.05V per cell
Over-discharge Protection	2.7V–3.0V per cell
Balance Current	30–60mA (approx)
Short Circuit Protection	Yes
PCB Size	Compact Design