21V 5S Lithium Battery Protection Board for Power Tools
21V 5S Lithium Battery Protection Board for Power Tools
21V 5S Lithium Battery Protection Board with LED Indicator
Keep your power tool batteries running safely and efficiently with this compact 21V 5S Lithium Battery Protection Board from DAZZLEEX. Engineered for seamless compatibility with a wide range of cordless power tools, this BMS (Battery Management System) circuit board provides reliable overcharge, over-discharge, and short-circuit protection — helping extend the life of your lithium battery packs.
Key Features
- Broad Compatibility: Designed for use with popular cordless power tools including drills, electric wrenches, and angle grinders.
- Built-in LED Indicator: Onboard status light lets you monitor charging and protection states at a glance.
- 5S Configuration: Supports 21V (5-series) lithium cell packs for optimal power tool voltage requirements.
- Multi-Layer Circuit Protection: Guards against overcharge, over-discharge, overcurrent, and short-circuit conditions to safeguard your batteries and tools.
- Compact & Durable: Constructed from ABS and metal materials; small 4.5 × 4 × 1.5 cm form factor fits neatly into most tool battery housings.
- DIY-Friendly: Ideal for battery pack rebuilds, electronics DIY projects, and power tool maintenance.
Specifications
| Product Name | Lithium Battery Protection Board |
| Configuration | 5S (21V) |
| Material | ABS + Metal |
| Color | Green |
| Dimensions | 4.5 × 4 × 1.5 cm |
| Country of Origin | Made in Mainland China |
Package Contents
- 1 × 21V 5S Lithium Battery Protection Board
Important Notes
- Please verify compatibility with your specific power tool battery pack before purchasing.
- Actual color may vary slightly from product images due to monitor display settings and lighting conditions.
- Please allow ±1–3 mm manual measurement deviation for listed dimensions.
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Frequently Asked Questions
Q: What power tools is this 21V 5S lithium battery protection board compatible with?
A: This protection board is designed for 21V (5S) lithium battery packs commonly used in cordless power tools such as electric drills, angle grinders, and electric wrenches. Please confirm the voltage and cell configuration of your battery pack matches 5S/21V before purchasing.
Q: What types of protection does this BMS circuit board provide?
A: The board provides overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection, helping to maintain the safety and longevity of your lithium battery cells during both charging and discharging cycles.
Q: Is this protection board easy to install for a DIY battery rebuild?
A: Yes — this board is designed with DIY enthusiasts and technicians in mind. Its compact size (4.5 × 4 × 1.5 cm) allows it to fit into most standard power tool battery housings. Basic soldering skills and knowledge of lithium battery wiring are recommended for safe installation.
Q: What does the LED indicator light on the board indicate?
A: The built-in LED indicator provides a visual status signal, helping you quickly identify whether the board is in normal charging mode or has triggered a protection function — making it easier to diagnose battery pack issues during use or maintenance.
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.