21V 7MOS Li-Battery Protection Board for Electric Tools

$29.05 $32.83

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21V 7MOS Lithium Battery Protection Board for Electric Tools

Keep your power tools running safely and efficiently with this 21V 7MOS Lithium Battery Protection Board. Engineered for DIY enthusiasts and professionals alike, this board features a built-in balancing circuit and temperature protection to extend battery life and safeguard your equipment from overcharge, over-discharge, and short-circuit events. Made in Mainland China.

Key Features

21V / 7MOS Design: Seven MOSFET transistors provide robust current handling for demanding electric tool applications.
Cell Balancing Circuit: Automatically equalizes cell voltages to maximize pack capacity and longevity.
Temperature Protection: Monitors operating temperature and cuts off power if unsafe levels are detected, preventing thermal damage.
Multi-Layer Safety: Guards against overcharge, over-discharge, overcurrent, and short-circuit conditions.
Compact Form Factor: Measures approximately 90.5 × 62 mm — easy to integrate into existing tool battery packs.
Durable Construction: Plastic + metal build for reliable, long-lasting performance in workshop environments.

Specifications

Voltage	21V
MOSFET Count	7MOS
Material	Plastic + Metal
Dimensions	Approx. 90.5 × 62 mm
Package Contents	1 × Protection Board (batteries not included)
Country of Origin	Made in Mainland China

Perfect For

Rebuilding or upgrading 21V lithium battery packs for power tools
DIY electronics and electrical projects
Battery pack repair and maintenance
Workshop and hobbyist use

Important Notes

Color may vary slightly from images due to monitor settings and lighting conditions. Please refer to the actual product received.
Dimensions are approximate; slight manual measurement deviations may occur.
Batteries are not included.

Frequently Asked Questions

Q: What type of battery cells is this 21V protection board compatible with?

A: This 21V 7MOS lithium battery protection board is designed for lithium-ion (Li-ion) cell packs configured to reach a 21V nominal or full-charge voltage, commonly used in cordless electric tools and DIY power packs. Please verify your cell configuration before installation.

Q: Does the balancing circuit work during charging or discharging?

A: The built-in balancing circuit actively equalizes cell voltages primarily during charging, ensuring all cells reach the same state of charge. This extends overall battery pack life and maintains consistent performance from your electric tools.

Q: Is soldering required to install this protection board?

A: Yes, installation typically involves soldering the board's connections to your battery cell terminals and output leads. Basic electronics and soldering skills are recommended for safe and proper installation.

Q: What protection features does this board include?

A: This board provides overcharge protection, over-discharge protection, overcurrent protection, short-circuit protection, and temperature protection — all managed through 7 MOSFET switches for reliable and safe battery pack operation.

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.

We prioritize quality in selecting the materials for our items, choosing premium fabrics and finishings that ensure durability, comfort, and timeless appeal.

We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.