1S 3.7V Lithium BMS Protection Board 5A 10A 15A 20A

1S 3.7V Lithium Battery Protection BMS Board — 5A / 10A / 15A / 20A

Keep your lithium battery packs running safely and efficiently with this compact 1S 3.2V–3.7V Battery Protection Board (BMS). Designed for single-cell lithium-ion and LiFePO4 battery applications, this board guards against overcharge, over-discharge, and overcurrent conditions — helping extend battery life and maintain safe operation in e-bikes, electric scooters, power tools, DIY projects, and more.

Choose from four current ratings — 5A, 10A, 15A, or 20A — to match your exact load requirements. Built from durable plastic and metal components, this protection board is engineered to handle daily use in demanding environments.

Key Features

• Wide compatibility: Suitable for 1S lithium-ion (3.7V) and LiFePO4 (3.2V) single-cell battery packs
• Multiple current options: Available in 5A, 10A, 15A, and 20A ratings
• Overcharge protection: Automatically cuts off charging when the cell reaches maximum voltage
• Over-discharge protection: Disconnects load when battery voltage drops below safe threshold
• Overcurrent & short-circuit protection: Shields your battery and connected devices from fault conditions
• Compact & lightweight construction: Plastic + metal build for durability in a small form factor
• Broad application range: Ideal for e-bikes, electric scooters, RC models, power banks, and DIY electronics
• 10 color/variant options: Multiple configurations to suit your project needs

Specifications

• Cell configuration: 1S (single cell)
• Operating voltage: 3.2V – 3.7V
• Current ratings available: 5A, 10A, 15A, 20A
• Material: Plastic + Metal
• Application: E-bike, electric scooter, power tools, DIY electronics

What Is a BMS Protection Board?

A Battery Management System (BMS) protection board is an essential safety component for lithium battery packs. It continuously monitors cell voltage and current, automatically intervening to prevent dangerous conditions. Learn more about battery safety standards from the U.S. Consumer Product Safety Commission (CPSC).

Frequently Asked Questions

Q: What does this 1S lithium battery protection board do?

A: This BMS protection board monitors and safeguards your single-cell lithium battery by automatically preventing overcharge, over-discharge, overcurrent, and short-circuit conditions. It acts as an electronic safety switch between the battery cell and your connected load or charger, helping maximize battery lifespan and ensure safe operation in e-bikes, scooters, and DIY electronics projects.

Q: Which current rating should I choose — 5A, 10A, 15A, or 20A?

A: Select a current rating that meets or slightly exceeds the maximum continuous current draw of your application. For small devices and low-power circuits, 5A is typically sufficient. For e-bikes, electric scooters, or power tools with higher draw, opt for the 15A or 20A version. Always match the BMS rating to your motor or load specifications for optimal protection.

Q: Is this protection board compatible with both Li-ion (3.7V) and LiFePO4 (3.2V) cells?

A: Yes. This 1S board is designed to work with standard lithium-ion cells (nominal 3.7V) as well as LiFePO4 cells (nominal 3.2V), making it versatile for a wide range of single-cell battery projects and replacements.

Q: What materials is this BMS board made from?

A: The protection board is constructed from a combination of plastic and metal components, providing a reliable and durable build suitable for everyday use in various electronics and battery-powered applications.