21V Li-Ion BMS Battery Protection Circuit Board 3MOS PCB
21V Li-Ion BMS Battery Protection Circuit Board 3MOS PCB
21V Li-Ion BMS Battery Protection Circuit Board – 3MOS
Keep your lithium-ion battery packs running safely and efficiently with this durable 21V BMS (Battery Management System) Protection Circuit Board. Designed with 3 MOS transistors, this compact PCB module delivers comprehensive multi-layer protection for your power tool battery packs, electric scooters, e-bikes, and more — all in a rugged, reusable metal construction built to handle vibration and demanding use.
Made in Mainland China.
Key Features
- Multi-Mode Protection: Built-in overvoltage, undervoltage, overcurrent, overcharge, and overheat protection safeguards every cell in the pack.
- 3 MOS Design: Three MOSFET transistors ensure stable, reliable switching and efficient current handling during charge and discharge cycles.
- Wide Compatibility: Suitable for 21V Li-ion battery packs used in power tools (torque wrenches, impact drills, angle grinders), electric scooters, e-bikes, electric motorcycles, electric tricycles, and other electric appliances.
- Stable & Anti-Vibration: Solid metal construction minimizes the effects of vibration, making it ideal for high-torque power tool applications.
- Reusable: Designed for long-term use — replace, repair, or upgrade your existing battery pack's protection module without replacing the whole battery.
Specifications
- Type: BMS PCB Battery Protection Board
- Configuration: 3MOS
- Compatible Voltage: 21V Li-Ion Battery Packs
- Material: Metal
- Battery Included: No
- Charger Included: No
- Reusability: Reusable
- Package Contents: 1 × PCB Protection Circuit Board
Compatible Applications
This BMS module is the ideal replacement or upgrade protection board for:
- 21V power tools (drills, impact drivers, angle grinders, torque wrenches)
- Electric scooters & e-bikes
- Electric motorcycles & tricycles
- Electric vehicles & appliances
Note: Color may vary slightly from images due to monitor brightness and lighting conditions. Please refer to the actual item received.
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Learn more: EPA guidance on lithium-ion battery handling
Frequently Asked Questions
Q: What does a BMS protection circuit board do for a lithium battery pack?
A: A BMS (Battery Management System) protection circuit board monitors and manages each cell in a lithium-ion battery pack. This 21V 3MOS board provides overvoltage, undervoltage, overcurrent, overcharge, and overheat protection — helping to extend battery life, maintain stable performance, and keep your devices operating safely.
Q: Is this BMS board compatible with my power tool battery?
A: This board is designed for 21V Li-ion battery packs and is compatible with a wide range of power tools including impact drills, torque wrenches, and angle grinders. It is also suitable for electric scooters, e-bikes, and similar electric vehicles. Always verify your pack's voltage and cell configuration before installation.
Q: Does this product come with a battery or charger?
A: No — this package includes only 1 × BMS PCB Protection Circuit Board. No battery or charger is included. It is intended as a replacement or repair component for existing 21V Li-ion battery packs.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.