5S BMS 18V/21V 18650 Lithium Battery Protection Board | Power Tools

18V/21V 5S BMS Protection Circuit Board for 18650 Lithium Battery Packs

Keep your cordless drills and electric power tools running safely and efficiently with this 5S BMS (Battery Management System) PCBA. Designed for 18650 lithium cell configurations, this protection circuit board manages charging up to 21V and provides essential overcharge, over-discharge, and short-circuit protection for your 18V drill battery packs.

Whether you're rebuilding a worn-out drill battery or building a custom 18650 pack from scratch, this compact and reliable BMS board is the perfect solution for DIY enthusiasts and professional technicians alike.

Key Features

• 5S Configuration: Compatible with 5-cell series 18650 lithium battery packs
• Rated Voltage: 18V nominal / 21V maximum charge voltage
• PCBA Design: Fully assembled board ready for integration
• 3MOS MOSFET: Triple MOSFET design for improved current handling and stability
• Overcharge Protection: Prevents cells from exceeding safe charge voltage
• Over-Discharge Protection: Safeguards cells from draining below safe thresholds
• Short-Circuit Protection: Instantly cuts power in fault conditions
• Compact Form Factor: Easy to fit inside standard drill battery housings
• Wide Compatibility: Suitable for cordless drills, electric screwdrivers, and other 18V power tools

Specifications

• Cell Configuration: 5S (5 cells in series)
• Nominal Voltage: 18V
• Charging Voltage: 21V
• Cell Type: 18650 Lithium-Ion
• MOSFET Count: 3MOS
• High-Concern Chemicals: None
• Made in Mainland China

What's in the Box

• 1 × 5S BMS PCBA Protection Circuit Board

Who Is This For?

This BMS board is ideal for DIY battery pack builders, repair technicians, and electronics hobbyists who want to rebuild or upgrade their cordless drill battery packs. It's a cost-effective way to restore and protect your existing 18V power tool batteries.

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Frequently Asked Questions

Q: What battery cell type is this 5S BMS board compatible with?

A: This BMS PCBA is designed for 18650 lithium-ion cells in a 5S (5 cells in series) configuration, making it suitable for 18V cordless drills and similar electric power tools that charge at up to 21V.

Q: Does this board provide short-circuit and overcharge protection?

A: Yes. The 5S BMS board includes built-in overcharge protection, over-discharge protection, and short-circuit protection via its 3MOS MOSFET design, ensuring your lithium cells operate within safe parameters at all times.

Q: Can I use this BMS board to rebuild my cordless drill battery pack?

A: Absolutely. This PCBA is a popular choice for DIY battery pack rebuilds. It fits standard 18V drill battery housings and works with most 18650 lithium cell brands, making it an affordable solution for restoring power tool batteries.