21V 7MOS Li-Battery Protection Board for Electric Tools
21V 7MOS Li-Battery Protection Board for Electric Tools
21V 7MOS Li-Battery Protection Board for Electric Tools
Keep your power tools running safely and efficiently with this 21V 7MOS Lithium Battery Protection Board. Designed for electric tools powered by Li-ion battery packs, this compact PCB module features a built-in balancing circuit and temperature protection to help extend battery life and maintain stable performance during heavy-duty use.
Whether you're rebuilding a battery pack or upgrading an existing setup, this reusable protection board offers a reliable solution for DIY enthusiasts and professional tradespeople alike.
Key Features
- 21V, 7MOS configuration — optimized for common cordless electric tool battery packs
- Built-in balancing circuit — keeps individual cells balanced for consistent performance and longer pack life
- Temperature protection — monitors heat levels to help prevent overheating during charge and discharge cycles
- Reusable design — built to last across multiple battery rebuilds
- Compact form factor — approximately 90.5 × 62 mm, fits neatly inside standard tool battery housings
- Plastic + metal construction — durable and lightweight
Specifications
- Voltage: 21V
- MOSFET Count: 7MOS
- Material: Plastic + Metal
- Dimensions: ~90.5 × 62 mm
- Package Contents: 1× Protection Board (batteries not included)
- Country of Origin: Made in China
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Note: Colors may vary slightly from images due to monitor settings and lighting conditions. Please allow minor measurement tolerances of ±1–2 mm.
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Frequently Asked Questions
Q: What type of battery packs is this 21V 7MOS protection board compatible with?
A: This Li-battery protection board is designed for 21V lithium-ion (Li-ion) battery packs commonly used in cordless electric tools such as drills, saws, and screwdrivers. Always verify your battery pack's voltage and cell configuration before installing.
Q: Does the balancing circuit activate during charging or discharging?
A: The built-in balancing circuit typically activates during the charging process to equalize voltage levels across individual cells, helping maintain consistent capacity and prolonging the overall life of the battery pack.
Q: Is the battery or charger included with this protection board?
A: No — this listing includes only the 21V 7MOS PCB protection board (1 piece). Batteries and charger are sold separately.
Q: What does the temperature protection feature do?
A: The temperature protection circuit monitors the board's operating temperature and can cut off current if unsafe heat levels are detected, helping to safeguard both the battery cells and the tool from damage caused by thermal stress.
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.