21V 8MOS Balance Protection Board for 18650 Battery Packs
21V 8MOS Balance Protection Board for 18650 Battery Packs
21V 8MOS Balance Protection Board for 18650 Battery Packs
Keep your DIY power tool battery packs running safely and efficiently with this 21V 8MOS Balance Protection Board. Designed specifically for 18650 lithium-ion cell configurations, this PCB features built-in cell balancing with LED indicators, over-charge and over-discharge protection, and a compact sidelight design — making it an essential component for angle grinders, chainsaws, electric wrenches, and other cordless power tools.
Key Features
- 21V Balance Protection Board — engineered for 18650 lithium cell packs used in power tools
- 8MOS Design — utilizes 8 MOSFET transistors for reliable switching and current handling
- Built-In Cell Balancing — actively balances individual cells to extend battery pack lifespan
- LED Balance Indicator — sidelight LED design provides a clear visual status of the balancing process
- Overcharge & Over-Discharge Protection — safeguards your cells from damage during charging and discharging cycles
- Short-Circuit Protection — helps prevent damage to your tools and battery cells
- Reusable & Durable — metal construction built to last across multiple builds and replacements
- Wide Compatibility — suitable for angle grinders, chainsaws, electric wrenches, and similar cordless power tools
Specifications
- Voltage: 21V
- MOSFET Count: 8MOS
- Compatible Cells: 18650 Lithium-Ion
- Material: Metal
- LED Indicator: Yes (Sidelight Design)
- Battery Included: No
- Charger Included: No
- Package Contents: 1 × Protection Board (PCB)
- Country of Origin: Made in Mainland China
Note: Due to variations in monitor brightness and lighting conditions, the actual product color may differ slightly from images shown. Please refer to the physical product received.
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Frequently Asked Questions
Q: What tools is this 21V 8MOS balance protection board compatible with?
A: This protection board is designed for 18650 lithium-ion battery packs used in a wide range of cordless power tools, including angle grinders, chainsaws, electric wrenches, and similar 21V DIY tools. Always verify your tool's battery pack specifications before installation.
Q: Does the board come with batteries or a charger?
A: No. This listing includes only the 1× PCB balance protection board. Batteries (18650 cells) and a charger are sold separately and are not included in the package.
Q: What does the LED sidelight indicator do?
A: The built-in LED indicator displays the real-time cell balancing status of your battery pack. It provides a quick and easy visual cue so you can confirm that the board is actively balancing your 18650 cells during the charging cycle.
Q: Is this board reusable if I rebuild my battery pack?
A: Yes. The board is fully reusable and constructed from durable metal components, making it suitable for multiple battery pack builds or replacements over time.
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.