1S BMS 2.5A Lithium Battery Protection Board Price in Bangladesh

The 1S BMS 2.5A Lithium Battery Protection Board is a compact battery protection module designed for single-cell rechargeable lithium-ion batteries. It is commonly used with 3.7V nominal Li-ion cells such as compatible 18650 cells, pouch cells, and other single-cell lithium-ion battery configurations.

The term 1S means that the battery system contains one series cell or one parallel group of cells. For a standard Li-ion cell with a nominal voltage of approximately 3.7V, the battery reaches approximately 4.2V when fully charged. The BMS is designed around this single-cell voltage range.

The primary purpose of this board is to provide an electronic protection layer between the battery and the external circuit. Lithium-ion batteries require careful voltage and current management because excessive charging, excessive discharge, or short circuits can damage the cell. A properly selected protection board helps reduce the risk associated with these operating conditions.

The 2.5A rating indicates the board’s intended current capability. It makes this type of module suitable for relatively low-power applications such as portable electronics, LED projects, small IoT devices, rechargeable gadgets, sensors, small motors, and DIY electronics projects.

Actual continuous current capability depends on the specific PCB, MOSFETs, PCB traces, temperature, wiring, connectors, and operating duration. Therefore, the 2.5A label should be treated as the board’s rated current class rather than a guarantee that every application can continuously draw 2.5A under all conditions.

A typical 1S protection board monitors the voltage of the connected lithium-ion cell. During charging, the protection circuit can disconnect the charging path if the cell reaches its specified overcharge threshold. During discharge, it can disconnect the load when the cell voltage falls below the specified over-discharge threshold.

The board can also provide overcurrent and short-circuit protection. If the load draws excessive current or a short circuit occurs, the protection circuit can disable the battery output.

It is important to understand that this module is primarily a protection circuit, not a complete battery charger. A suitable single-cell Li-ion charging circuit should be used to charge the battery correctly. The charger should use the appropriate 4.2V constant-current/constant-voltage charging method for a standard Li-ion cell.

The 1S BMS can be used with many different physical battery formats. For example, a suitable single 18650 cell can be connected to the board, provided the cell chemistry and electrical characteristics are compatible. The same principle applies to suitable single-cell Li-ion pouch batteries.

When using a protected battery system, the battery cell should also be in good condition. A BMS cannot make a damaged, unsuitable, or incorrectly assembled battery safe. Proper cell selection, wiring, insulation, charging, and mechanical protection remain important.

For projects using a single battery cell, the compact size of a 1S BMS is particularly useful. It can be installed inside small enclosures and integrated into rechargeable products without adding significant complexity.

The 1S BMS 2.5A Lithium Battery Protection Board is therefore a practical choice for makers, students, technicians, engineers, and DIY electronics enthusiasts who need basic protection for a single-cell lithium-ion battery system.

What is a 1S BMS?

A 1S BMS is a Battery Management System designed for one series-connected lithium-ion cell or one parallel cell group.

For a standard 3.7V Li-ion cell:

• Nominal voltage: approximately 3.7V
• Full-charge voltage: approximately 4.2V
• 1S: one series cell/group

If several identical cells are connected in parallel, they still form a 1S battery because there is only one voltage level. The parallel arrangement increases capacity and potentially current capability, but the BMS must be suitable for the resulting pack.

Key Features

• Designed for single-cell Li-ion batteries
• 2.5A-class current capability
• 3.7V nominal battery system
• 4.2V full-charge voltage
• Overcharge protection
• Over-discharge protection
• Overcurrent protection
• Short-circuit protection
• Compact PCB design
• Suitable for rechargeable Li-ion cells
• Compatible with suitable 18650 applications
• Useful for DIY battery projects
• Suitable for portable electronics
• Suitable for low-power embedded systems
• Easy to integrate into custom battery projects

Technical Specifications

• Product Type: Li-ion Battery Protection Board
• Configuration: 1S
• Battery Chemistry: Lithium-Ion
• Nominal Voltage: 3.7V
• Full-Charge Voltage: 4.2V
• Rated Current: Up to 2.5A
• Cell Count: 1 Series
• Protection: Overcharge, Over-discharge, Overcurrent, Short Circuit
• Application: Single-cell rechargeable Li-ion battery
• PCB Type: Compact Protection Circuit Board

Important: Exact protection thresholds, operating current, quiescent current, short-circuit response time, PCB dimensions, MOSFET type, and terminal configuration can vary between manufacturers and board versions. Always verify the specifications and markings on the exact module before installation.

Working Principle

The 1S BMS monitors the voltage of the connected lithium-ion battery.

During charging, the battery voltage gradually rises. When the cell reaches the board’s specified overcharge protection threshold, the protection circuit can disconnect the charging path.

During discharge, the battery voltage decreases. If the voltage falls below the specified over-discharge threshold, the BMS can disconnect the load to help prevent excessive discharge.

The current-protection circuit monitors the current flowing through the battery. If the current exceeds the specified limit, the BMS can disable the output.

If the external circuit develops a short circuit, the protection circuitry can rapidly disconnect the battery depending on the board’s design.

After the abnormal condition is removed and the appropriate recovery conditions are met, the protection circuit may reconnect the battery.

Applications

The 1S BMS 2.5A Protection Board can be used in:

• 18650 Li-ion battery projects
• Single-cell rechargeable devices
• Portable electronics
• LED lighting projects
• Small IoT devices
• Arduino and microcontroller projects
• Rechargeable sensors
• Small robotics projects
• Bluetooth electronics
• Portable audio equipment
• DIY power supplies
• Small fans and pumps
• Rechargeable toys
• Battery-powered instruments
• Educational electronics projects
• Custom battery-powered products

Advantages

• Compact and lightweight
• Designed for single-cell Li-ion batteries
• Provides multiple protection functions
• Helps protect against overcharging
• Helps prevent excessive discharge
• Provides overcurrent protection
• Provides short-circuit protection
• Easy to integrate into DIY projects
• Suitable for low-power applications
• Compatible with many single-cell Li-ion configurations
• Cost-effective battery protection solution

Limitations

• Designed specifically for 1S Li-ion batteries.
• It should not automatically be used with LiFePO4 cells.
• The 2.5A rating may depend on thermal and electrical conditions.
• It is not a replacement for a dedicated Li-ion charging module.
• Protection thresholds vary by board design.
• It does not necessarily provide advanced battery monitoring.
• It does not automatically indicate remaining battery capacity.
• It cannot compensate for damaged or mismatched cells.

Installation / Usage Tips

• Confirm that your battery is a compatible single-cell Li-ion system.
• Verify the battery polarity before connecting the board.
• Follow the PCB markings for battery and load/charger connections.
• Connect the cell only to the appropriate battery terminals.
• Use a suitable 4.2V Li-ion charging circuit.
• Do not connect an inappropriate charger directly to the battery.
• Select wires and connectors appropriate for the expected current.
• Insulate exposed terminals to prevent accidental short circuits.
• Keep the PCB away from conductive surfaces.
• Do not reverse the battery polarity.
• Do not use a damaged, swollen, leaking, or physically compromised cell.
• Test the battery voltage before connecting sensitive electronics.
• For permanent installations, secure the battery and PCB mechanically.

1S BMS vs 1S Charger

A common misunderstanding is that a BMS and a charger perform the same function. They do not.

A 1S charger controls the charging process, typically using a constant-current/constant-voltage charging profile appropriate for a 4.2V Li-ion cell.

A 1S BMS/protection board primarily protects the battery against abnormal voltage and current conditions.

For a complete rechargeable product, both functions may be needed. Some charging modules include their own protection circuit, while others require a separate BMS.

1S BMS for 18650 Battery

This BMS can be useful for projects based around a compatible single 18650 Li-ion cell.

For example, a portable electronics project may use:

18650 Li-ion Cell → 1S BMS → Load

The charging circuit should be designed appropriately for the same battery system.

If multiple cells are connected in parallel, the complete group remains 1S electrically, but the cells should be properly matched and connected using an appropriate battery-pack design.

Why Choose 1S BMS 2.5A Lithium Battery Protection Board?

The 1S BMS 2.5A Lithium Battery Protection Board is a simple and economical solution for adding basic protection to single-cell lithium-ion projects.

Its compact form factor makes it particularly useful where space is limited. The 2.5A-class current capability also makes it appropriate for many low-power portable electronics and DIY applications.

For students, makers, technicians, and electronics engineers, it provides an easy way to incorporate essential battery protection into custom rechargeable projects.

Why Buy from Electroxbd?

• 100% Quality Tested Products
• Trusted Source for Reliable Electronic Parts
• Fast Delivery Across Bangladesh
• Competitive Pricing
• Quality Battery Management Products
• Dedicated Technical Support
• Suitable for DIY Battery Projects
• Ideal for Students, Engineers, Technicians and Makers
• Nationwide Delivery Across Bangladesh

Frequently Asked Questions (FAQ)

What voltage battery can I use with this 1S BMS?

It is designed for a standard 3.7V nominal rechargeable Li-ion battery, which reaches approximately 4.2V when fully charged.

What does 2.5A mean on the BMS?

The 2.5A rating indicates the board’s rated current class. Actual continuous current capability depends on the board design, MOSFETs, wiring, temperature, and operating conditions.

Can I use this BMS with a single 18650 battery?

Yes. A compatible single 18650 Li-ion cell is a typical application for a 1S BMS, provided the cell and board specifications are compatible.

Can I use this BMS with LiFePO4?

Not unless the exact board is specifically designed for LiFePO4 chemistry. Standard Li-ion and LiFePO4 batteries have different voltage characteristics and require different protection thresholds.

Does this BMS charge the battery?

No. It is primarily a protection board. A suitable 4.2V Li-ion charger should be used to properly charge a standard 1S Li-ion battery.

Does this board show the battery percentage?

No. A basic 1S BMS protects the battery but does not necessarily provide a battery-capacity display. A separate battery indicator can be added if required.

Where can I buy a 1S BMS 2.5A Lithium Battery Protection Board in Bangladesh?

You can buy the 1S BMS 2.5A Lithium Battery Protection Board from Electroxbd, a trusted supplier of electronic components, battery-management modules, rechargeable batteries, and DIY electronics products in Bangladesh.

Common Questions:

Q: What is the price of 1S BMS 2.5A Lithium Battery Protection Board in Bangladesh?

A: The latest price of 1S BMS 2.5A Lithium Battery Protection Board in Bangladesh is 30 BDT.

Q: Where to buy 1S BMS 2.5A Lithium Battery Protection Board in Bangladesh?

A: You can buy the 1S BMS 2.5A Lithium Battery Protection Board at the best price from ElectroXBD in Bangladesh.