5S 21V 25A Lithium Battery Protection Board

Product Description:
Ensure safe and reliable battery performance with this 5S 21V 25A lithium battery protection board. Designed for Makita-style power tools and DIY battery packs, it provides advanced protection against overcharge, over-discharge, and short circuits—helping extend battery life and improve safety during operation.

Specifications:

• Model: 5S BMS (Battery Management System)
• Voltage: 21V (for 5-series lithium batteries)
• Current: 25A continuous charge/discharge
• Compatibility: 18650 / 21700 lithium-ion battery packs
• Application: Makita power tools and DIY battery packs
• Material: PCB circuit board with integrated IC chip
• Protection Functions: Overcharge, over-discharge, overcurrent, short circuit

Key Features:

• Intelligent battery management for stable performance
• Real-time monitoring of voltage, current, and temperature
• Multi-layer protection system for enhanced safety
• High current support ideal for power tools
• Fast response to short circuit and overload conditions

Other Details:

• Suitable for battery repair and DIY projects
• Helps extend battery lifespan and efficiency
• Compact and easy to integrate into battery packs
• Commonly used in cordless tools, e-bikes, and portable devices
• Requires proper battery matching and installation for best performance