5S 21V Lithium Battery Protection Board PCB Charge Module
5S 21V Lithium Battery Protection Board PCB Charge Module
5S 21V Lithium Battery Protection Board — PCB Charge Module for Power Tools
Keep your cordless power tools running safely and efficiently with this 5S 21V Lithium Battery Protection Board. Designed for 5-cell (21V) lithium battery packs used in screwdrivers and other power tools, this compact PCB module delivers real-time monitoring and multi-layer protection to extend battery life and prevent damage.
Key Features
- Real-Time Monitoring: Uses a dedicated IC processor to continuously track voltage, charge/discharge current, and ambient temperature across each battery cell.
- Overcharge Protection: Automatically cuts off charging when cells reach full capacity, preventing damage from excess voltage.
- Over-Discharge Protection: Disconnects the load when battery voltage drops too low, preserving cell health and longevity.
- Short Circuit Protection: Instantly interrupts the circuit in the event of a short, safeguarding both the battery and connected tools.
- 3-MOS Design: Three MOSFET switches provide stable, reliable charge and discharge management for consistent performance.
- Compact & Board-Ready: Measures 90.3 × 67.06 mm — easy to integrate into standard cordless tool battery packs.
- Durable PCB Construction: High-quality printed circuit board material built to withstand the demands of regular workshop use.
Specifications
- Compatible Battery Configuration: 5S (5-cell) Lithium-Ion / Li-Ion
- Rated Voltage: 21V
- Board Dimensions: 90.3 × 67.06 mm
- MOSFET Count: 3 MOS
- Material: PCB (Printed Circuit Board)
- Application: Screwdrivers, cordless drills, and compatible 21V power tools
Who Is This For?
Whether you're a DIY enthusiast rebuilding a battery pack or a professional technician maintaining a fleet of power tools, this protection board is an essential component. It's also a practical and thoughtful gift for makers, hobbyists, and anyone who works with rechargeable lithium battery systems.
Learn More About Lithium Battery Safety
Proper battery management is critical for safety and performance. For general guidance on electrical safety standards and battery handling, visit the U.S. Consumer Product Safety Commission (CPSC) Battery Safety page.
Frequently Asked Questions
Q: What does the 5S 21V Lithium Battery Protection Board do?
A: This PCB protection module continuously monitors the voltage, charge/discharge current, and temperature of each cell in a 5S (21V) lithium battery pack. It actively guards against overcharging, over-discharging, and short circuits — keeping your battery pack and connected power tools operating safely.
Q: What power tools is this protection board compatible with?
A: This module is designed for 5-cell (5S) 21V lithium battery packs, making it compatible with most cordless screwdrivers, drills, and similar 21V power tools that use this cell configuration. Always verify your existing battery pack's cell count and voltage before installation.
Q: What are the dimensions of this PCB module?
A: The board measures 90.3 × 67.06 mm, making it a compact, easy-to-fit solution for standard cordless tool battery housings.
Q: Is this board difficult to install?
A: Installation requires basic electronics knowledge, including soldering and understanding of battery wiring. It is recommended for users comfortable with PCB assembly or battery pack rebuilding. Always follow proper electrical safety precautions when working with lithium cells.