5S 21V Li-Ion BMS Protection Circuit Board for Power Tools
5S 21V Li-Ion BMS Protection Circuit Board for Power Tools
5S 21V Lithium Battery BMS Protection Circuit Board
Keep your lithium battery packs running safely and efficiently with this 5S 21V Battery Management System (BMS) Protection Circuit Board. Designed for power tools and electric vehicles, this compact PCB module provides multi-layer protection to extend battery life and maintain stable performance across demanding applications.
Made in Mainland China.
Key Features
- Comprehensive Protection: Overvoltage, undervoltage, overcurrent, overcharge, and overheat protection for each individual cell in the pack.
- 3 MOS Design: High-quality MOSFET configuration for reliable switching and stable current management in power tool applications.
- Wide Compatibility: Suitable for most electric power tools, electric scooters, electric bicycles, electric motorcycles, electric tricycles, electric vehicles, and various electric appliances.
- Anti-Vibration Stability: Engineered for rugged environments — an ideal match for 21V torque wrenches, impact drills, and angle grinders.
- Reusable & Durable: Constructed from plastic and metal components for long-lasting, reusable service.
- Per-Cell Monitoring: Independently monitors and protects each cell in the battery pack for balanced performance.
Specifications
| Configuration | 5S (5 cells in series) |
| Voltage | 21V |
| Material | Plastic + Metal |
| Battery Type | Li-Ion / Lithium |
| Reusability | Reusable |
| Battery Included | No |
| Charger Included | No |
| Country of Origin | Mainland China |
Package Contents
- 1 × 5S 21V BMS Protection Circuit Board (PCB)
Important Notes
- Product color may vary slightly from images due to monitor brightness and lighting conditions. Please refer to the actual product received.
- Please allow slight measurement deviation for listed dimensions.
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Frequently Asked Questions
Q: What does a 5S 21V BMS protection circuit board do?
A: A 5S 21V BMS (Battery Management System) protection circuit board monitors and protects a lithium battery pack made up of 5 cells in series. It safeguards the pack against overvoltage, undervoltage, overcurrent, overcharge, and overheating — helping maintain safe operation and prolong battery life for power tools and electric vehicles.
Q: Is this BMS board compatible with my power tools?
A: Yes — this 5S 21V BMS module is designed to be compatible with most 21V lithium-powered electric tools, including torque wrenches, impact drills, and angle grinders, as well as electric scooters, bicycles, motorcycles, tricycles, and other electric appliances.
Q: Does this board come with a battery or charger?
A: No. The package includes only the BMS protection circuit board (PCB). Batteries and chargers are not included and must be sourced separately.
Q: Can I reuse this BMS board if I rebuild my battery pack?
A: Yes. This BMS protection circuit board is designed to be reusable, making it a cost-effective choice for battery pack rebuilds and replacements.
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.