21V 18650 Battery Protection Board for Makita – 6MOS 30A/5MOS 25A
5MOS 25A
$12.08
Sale price
$12.08
Regular price
$16.99
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21V 18650 Battery Protection Board for Makita – 6MOS 30A/5MOS 25A
$12.08
Sale price
$12.08
Regular price
$16.99
Shipping calculated at checkout.
Makita 18650 Battery Protection Circuit Board – 21V Replacement
Keep your Makita 18650 lithium battery packs running safely and reliably with this high-quality 21V Battery Protection Board. Available in two configurations — 6MOS 30A and 5MOS 25A — this replacement BMS (Battery Management System) circuit board features a 5-string cell layout, alloy copper hardware, and built-in temperature control for comprehensive battery protection.
Whether you're rebuilding a worn-out Makita power tool battery or upgrading an existing pack, this CE-certified board delivers over-charge, over-discharge, over-current, and short-circuit protection to extend the life of your battery cells and protect your tools.
Made in Mainland China.
Key Features
- Compatible with Makita 18650 battery packs — ideal replacement for DIY battery rebuilds
- Two configurations available: 6MOS 30A (higher current) or 5MOS 25A
- 5-string (5S) large board design — supports 21V nominal lithium-ion packs
- Temperature control protection — prevents thermal runaway and overheating
- Alloy copper hardware — for low resistance and reliable high-current performance
- CE Certified — meets European safety and electromagnetic compatibility standards
- Protects against: overcharge, over-discharge, overcurrent, and short circuit
- Low voltage range: below 75V DC / below 50V AC
Specifications
| Voltage | 21V (5S Li-ion) |
| Configurations | 6MOS 30A / 5MOS 25A |
| Cell Compatibility | 18650 Lithium-Ion |
| Certification | CE |
| Temperature Control | Yes |
| Battery Included | No |
| Charger Included | No |
| Package Contents | 1 × Protection Board |
| Origin | Mainland China |
What's in the Box?
- 1 × 21V 18650 Battery Protection Circuit Board (your choice of 6MOS 30A or 5MOS 25A)
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For general guidance on lithium battery safety standards and best practices, refer to the U.S. Consumer Product Safety Commission – Lithium-Ion Battery Safety.
Learn more: Printed circuit board
Frequently Asked Questions
Q: Which Makita battery packs is this 21V protection board compatible with?
A: This 21V 5-string (5S) lithium-ion battery protection board is designed to be compatible with Makita 18650 cell battery packs that operate at a 21V nominal voltage. It is commonly used in DIY battery rebuilds for Makita 18V/21V power tool batteries. Always verify the cell count and layout of your specific pack before installation.
Q: What is the difference between the 6MOS 30A and 5MOS 25A versions?
A: The 6MOS 30A version uses six MOSFET switches and supports a higher continuous discharge current of 30A, making it better suited for high-drain power tools. The 5MOS 25A version uses five MOSFETs and handles up to 25A, suitable for moderate-demand applications. Choose based on the peak current requirements of your power tool.
Q: Does this protection board include over-temperature protection?
A: Yes. This board features built-in temperature control, which monitors the battery's thermal state and cuts off the circuit if temperatures exceed safe limits — helping prevent thermal runaway, battery damage, and potential safety hazards.
Q: Is any soldering required for installation?
A: Yes, installing a battery protection board typically requires soldering skills and the appropriate tools. It is recommended for users with experience in electronics repair or battery rebuilding. If you are unsure, consult a qualified technician.
Details
This product is crafted with quality materials to ensure durability and performance. Designed with your convenience in mind, it seamlessly fits into your everyday life.
Shipping & Returns
We strive to process and ship all orders in a timely manner, working diligently to ensure that your items are on their way to you as soon as possible.
We are committed to ensuring a positive shopping experience for all our customers. If for any reason you wish to return an item, we invite you to reach out to our team for assistance, and we will evaluate every return request with care and consideration.
