4S BMS 100A 12V LiFePO4 Battery Protection Board

• The4S BMS 100A 12V LiFePO4 Battery Protection Board is a safety and control module used for 4 lithium-ion batteries connected in series. BMS means Battery Management System. Its main job is to protect the battery pack and help it work safely.
• This BMS board controls how the battery charges and discharges. 4S BMS 100A 12V LiFePO4 Battery Protection Board It protects the battery from problems like overcharging, over-discharging, overcurrent, and short circuit. These protections help prevent battery damage and increase the life of the battery pack.
• The 4S 100A BMS can handle up to 100 Amps of current, which makes it suitable for high power battery systems. 4S BMS 100A 12V LiFePO4 Battery Protection Board It is commonly used in electric bikes, power tools, solar battery packs, DIY battery systems, and energy storage systems.
• The board is compact, reliable, and easy to install. 4S BMS 100A 12V LiFePO4 Battery Protection Board It is widely used by technicians, engineers, and electronics hobbyists who build lithium battery packs.

What is a 4S BMS?

A 4S BMS is designed for 4 lithium battery cells connected in series.

Each lithium battery cell normally has a voltage of 3.7V.

So when 4 cells are connected in series, the total voltage becomes:

3.7V × 4 = 14.8V

This means the battery pack is a 14.8V lithium battery pack.

When the battery pack is fully charged, the voltage can reach 16.8V. 4S BMS 100A 12V LiFePO4 Battery Protection Board  The BMS monitors this voltage and stops charging if it becomes too high.

Key Features of 4S 100A BMS

Supports 4 Battery Cells
Designed for 4 lithium-ion cells connected in series (4S battery pack).

High Current Capacity – 100A
This BMS supports up to 100 Amp discharge current, which is suitable for high power applications.

Overcharge Protection
Stops charging when the battery voltage becomes too high.

Over-Discharge Protection
Prevents the battery from discharging too much.

Overcurrent Protection
Cuts the power if the current becomes too high.

Short Circuit Protection
Protects the battery pack from short circuits.

Battery Balance Function
Helps keep all battery cells balanced for better battery life.

Compact Board Design
Small PCB board that can easily fit inside battery packs.

Applications

The4S BMS 100A 12V LiFePO4 Battery Protection Board is used in many battery-powered systems.

Electric Bikes and Scooters

Many electric bikes and scooters use lithium battery packs with BMS protection for safety.

Power Tools

Used in high power cordless tools like drills and cutters.

DIY Battery Packs

Electronics hobbyists use this BMS to build custom lithium battery packs.

Solar Energy Storage

Useful for solar battery storage systems using lithium batteries.

LED Power Systems

Used in high power LED battery systems.

Portable Power Systems

Used in portable battery backup systems.

How the 4S 100A BMS Works

The BMS is connected directly to the battery cells and constantly monitors the battery pack.

During charging:

• The BMS checks the voltage of each battery cell.
• If the voltage becomes too high, the BMS stops charging.

During discharging:

• The BMS monitors the current flow.
• If the current becomes too high, the BMS cuts the output.

If a short circuit happens, the BMS immediately disconnects the battery to prevent damage.

This protection system keeps the battery pack safe and improves its lifespan.

Advantages of Using a 4S BMS 100A 12V LiFePO4 Battery Protection Board

Battery Safety
Protects the battery pack from damage.

Longer Battery Life
Balanced charging helps batteries last longer.

High Current Support
Suitable for high power battery systems.

Reliable Operation
Provides stable battery performance.

Easy Installation
Simple wiring connections.

Compact Design
Small and lightweight board.

Installation Tips

Follow these basic steps when installing the BMS.

Connect Battery Cells Correctly

The board usually has the following battery terminals:

• B+
• B-
• B1
• B2
• B3

These connect to the battery cells.

Connect Output Terminals

The output terminals are:

• P+
• P-

These are used for both charging and discharging connections.

Check Wiring Carefully

Always check wiring before connecting the battery.

Use Good Quality Cells

Use good lithium-ion cells such as 18650 batteries.

Voltage Details

Each lithium battery cell has a nominal voltage of 3.7V.

When 4 cells are connected in series, the battery pack voltage becomes:

Nominal Voltage: 14.8V

When the battery is fully charged, the voltage becomes:

Full Charge Voltage: 16.8V

If the battery voltage becomes too low (around 10V to 11V), 4S BMS 100A 12V LiFePO4 Battery Protection Board the BMS will stop discharging to protect the battery.

Specifications

Battery Type: Lithium-ion / Li-ion
Battery Configuration: 4S (4 cells in series)
Nominal Voltage: 14.8V
Full Charge Voltage: 16.8V
Maximum Discharge Current: 100A

Protection Functions:

• Overcharge protection
• Over-discharge protection
• Overcurrent protection
• Short circuit protection
• Cell balancing function

Board Type: Battery Protection Module (BMS)
Board Design: Compact PCB

Why Choose Superway 4S 100A BMS?

At Superway, we focus on providing reliable and high-quality electronic components.

Our 4S 100A BMS boards are tested to ensure safe battery operation and stable performance.

Benefits of choosing Superway:

• Reliable battery protection
• Stable performance
• Durable board design
• Easy installation
• Affordable price

Superway components are trusted by engineers, technicians, and electronics hobbyists.