21700 BMS Protection Circuit Board for 21V Power Tool Batteries
21700 BMS Protection Circuit Board for 21V Power Tool Batteries
21700 Lithium Battery BMS Protection Circuit Board – 21V Power Tools
Keep your cordless power tools running safely and efficiently with this high-quality Battery Management System (BMS) Protection Circuit Board, designed specifically for 21700 lithium battery packs used in 21V power tools. Compatible with brands such as Lomvum, Zhipu, and Hongsong, this PCB replacement board helps safeguard your battery pack against overcharge, over-discharge, and short-circuit conditions — extending the working life of your tools and batteries.
Made in Mainland China.
Key Features
- Purpose-Built BMS: Designed for 21700 lithium cell configurations in 21V cordless power tool battery packs.
- CE Certified: Meets CE safety standards for electrical components.
- Overcurrent & Short-Circuit Protection: Integrated protection circuits help prevent damage from electrical faults.
- Over-Charge & Over-Discharge Protection: Helps maintain optimal battery cell health over time.
- Compact PCB Size: Measures approximately 98 × 60 mm (3.86 × 2.36 in) — fits neatly into compatible tool battery housings.
- DIY & Repair Friendly: Ideal for electronics hobbyists and tool repair technicians rebuilding battery packs.
- Brand New: Each board is new and quality-checked before shipment.
Specifications
- Material: PCB (Printed Circuit Board)
- Size: 98 × 60 mm / 3.86 × 2.36 in
- Compatible Battery Type: 21700 Lithium
- Compatible Voltage: 21V
- Certification: CE
- Origin: Mainland China
- Package Includes: 1 × BMS Protection Circuit Board
Important Notes
- Photos may not reflect the actual size — please refer to the dimensions listed above.
- Allow ±5–10 mm variance due to manual measurement.
- Actual color may vary slightly from images due to monitor settings and lighting.
- This is an aftermarket replacement part, not an OEM original board.
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Frequently Asked Questions
Q: Which power tool brands is this BMS protection circuit board compatible with?
A: This 21V BMS protection circuit board is designed to be compatible with 21700 lithium battery packs used in Lomvum, Zhipu, and Hongsong brand power tools. Always verify the dimensions (98 × 60 mm) and cell configuration of your existing battery pack before installing.
Q: What does the BMS (Battery Management System) protection circuit board do?
A: The BMS protection circuit board monitors and manages the 21700 lithium battery cells in your power tool battery pack. It provides overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection — helping to maintain safe operation and extend overall battery lifespan.
Q: Is this an original OEM board or an aftermarket replacement?
A: This is a brand-new aftermarket (non-original) replacement BMS protection circuit board. It is not an OEM part but is built to perform the same protection functions for compatible 21V lithium battery packs.
Q: What tools or skills do I need to install this circuit board?
A: Installation requires basic electronics knowledge, including the ability to solder connections and safely handle lithium battery cells. This board is best suited for experienced DIY electronics enthusiasts or professional battery repair technicians.