FMA 4S/5S BMS for Makita 14.4V 18V Li-ion Battery BL1430 BL1830 PCM

FMA BMS Protection Board for Makita Power Tool Batteries

Professional-grade Battery Management System (BMS) protection circuit board specifically designed for Makita power tool battery packs. Supports both 4S (14.4V) and 5S (18V) configurations, making it ideal for rebuilding or replacing Makita BL1430, BL1830, BL1860 battery packs and compatible models.

Key Features

• Dual Configuration Support: Compatible with both 4S (14.4V) and 5S (18V) Makita battery packs
• Makita Compatible: Designed specifically for Makita power tool battery systems
• Multi-Protection: Overcharge, over-discharge, overcurrent, and short circuit protection
• Wide Compatibility: Works with BL1430, BL1830, BL1860, and compatible Makita battery models
• High Reliability: Quality components ensure long-term stable operation
• Professional Grade: Suitable for battery rebuilds and replacements

Package Contents

• 1× FMA BMS Protection Circuit Board (Makita Compatible)

Technical Specifications

Configuration	4S or 5S (4-5 cells in series)
4S Nominal Voltage	14.4V (3.6V per cell)
5S Nominal Voltage	18V / 18.5V (3.6-3.7V per cell)
4S Full Charge Voltage	16.8V (4.2V per cell)
5S Full Charge Voltage	21V (4.2V per cell)
Overcharge Protection Voltage	4.25V ± 0.05V per cell
Over-discharge Protection Voltage	2.5V ± 0.1V per cell
Battery Chemistry	Li-ion
Compatible Models (4S 14.4V)	BL1430, 194066-1, 194065-3, BDA340, BDF440, BFR540, BHP440, BJV140, BTP130
Compatible Models (5S 18V)	BL1830, BL1860, and compatible 18V Makita batteries
Weight	Approximately 100g
Condition	Brand New

Compatible Makita Battery Models

14.4V (4S) Models:

• BL1430 (3.0Ah)
• 194066-1
• 194065-3
• Compatible with: BDA340, BDF440, BFR540, BHP440, BJV140, BTP130 power tools

18V (5S) Models:

• BL1830 (3.0Ah)
• BL1860 (6.0Ah)
• Other compatible 18V Makita lithium-ion batteries

Applications

• Makita 14.4V power tool battery pack rebuilds
• Makita 18V power tool battery pack rebuilds
• BL1430 battery replacement and repair
• BL1830/BL1860 battery replacement and repair
• Cordless drill battery assemblies
• Impact driver battery packs
• Circular saw battery systems
• Custom Makita-compatible battery projects
• DIY battery rebuilds and upgrades

Protection Functions

Overcharge Protection: Automatically disconnects charging when any cell reaches the overcharge protection voltage (4.25V ± 0.05V), preventing battery damage from excessive voltage.

Over-discharge Protection: Cuts off discharge when any cell voltage drops to the protection threshold (2.5V ± 0.1V), preventing deep discharge that can permanently damage lithium cells.

Overcurrent Protection: Monitors discharge current and disconnects the load if current exceeds safe limits, protecting both the battery and connected power tools.

Short Circuit Protection: Instantly disconnects the battery in the event of a short circuit, preventing fire hazards and equipment damage.

Installation & Wiring

Before Installation:

• Determine whether you are rebuilding a 4S (14.4V) or 5S (18V) battery pack
• Ensure all battery cells are balanced and at similar voltage levels (within 0.1V)
• Verify that the battery pack voltage matches your chosen configuration
• Have the original Makita battery case ready for reassembly
• Prepare necessary tools: soldering iron, wire strippers, multimeter, heat-shrink tubing
• Work in a clean, well-ventilated area with proper ESD protection
• Wear safety glasses and insulated gloves

Wiring Guidelines:

• For 4S configuration: Connect balance wires to B0 through B4 (4 cells)
• For 5S configuration: Connect balance wires to B0 through B5 (5 cells)
• Use appropriate wire gauge for main power connections
• Double-check polarity before making final connections
• Ensure all solder joints are clean and secure with good electrical contact
• Insulate all connections with heat-shrink tubing to prevent shorts
• Test voltage at each balance point with a multimeter before powering on
• Verify total pack voltage is within expected range (14.4V-16.8V for 4S, 18V-21V for 5S)
• Ensure proper fit within the original Makita battery case

Required Skills:

• Understanding of lithium battery chemistry and safety
• Proficiency in soldering and electrical connections
• Ability to disassemble and reassemble Makita battery cases
• Knowledge of proper battery handling and safety protocols
• Experience with multimeter usage and voltage testing

Who Should NOT Attempt Installation:

• Individuals without electrical or electronics experience
• Those unfamiliar with lithium battery safety requirements
• Anyone without proper tools or workspace
• Minors without qualified adult supervision
• If unsure about any aspect of installation, consult a professional technician

Important Notes

Configuration Selection: This BMS board supports both 4S (14.4V) and 5S (18V) configurations. Make sure to wire the correct number of cells for your specific Makita battery model. Using the wrong configuration can result in improper protection and potential safety hazards.

Makita Compatibility: This BMS is designed to work with Makita power tool battery systems. Ensure your battery case and tool are compatible before purchase.

Connector Customization: We ship the standard configuration as shown in the main product images. If you require specific connectors or custom wire arrangements for your Makita battery rebuild, please refer to the product gallery images and contact us with your requirements before ordering.

Testing: After installation, perform thorough testing including voltage checks at all balance points, charge/discharge cycles with a Makita charger, and protection function verification before putting the battery pack into regular use with power tools.

Why Choose FMA BMS Products?

FMA specializes in high-quality battery management solutions for power tool battery systems. Our BMS boards are manufactured using premium components and undergo rigorous quality control testing to ensure reliable protection and long service life. Each board is inspected and tested before shipment to guarantee it meets our strict quality standards. The dual 4S/5S configuration support provides flexibility for various Makita battery rebuild projects.

Custom BMS Solutions

Need a different cell configuration, current rating, or custom features for your power tool battery project? We offer custom BMS design and manufacturing services. Contact us with your specifications including cell count, voltage requirements, current ratings, and any special features you need, and we'll create a tailored solution for your application.

Safety Information

Charging: Use only Makita-compatible chargers designed for your specific battery voltage (14.4V or 18V) with proper voltage and current specifications. Never exceed the maximum charging voltage.

Storage: Store in a cool, dry place away from direct sunlight, heat sources, and flammable materials. Keep out of reach of children.

Operation: Do not bypass or disable protection functions. Do not expose to water, moisture, or conductive materials that could cause short circuits.

Temperature: Operate within recommended temperature range. Avoid extreme temperatures during charging and discharging.

Disposal: Dispose of according to local regulations for electronic waste. Do not incinerate or dispose of in regular trash.

Inspection: Regularly inspect for signs of damage, overheating, or component failure. Discontinue use immediately if any abnormalities are detected.

Shipping & Transportation Notice

Hazardous Material: This product is designed for use with lithium batteries and may be subject to shipping restrictions.

Air Transport Restrictions: Due to international air transport regulations, shipments may be subject to additional restrictions and longer transit times.

Packaging Compliance: All shipments comply with applicable packaging requirements for electronic components.

Delivery Time: Electronic component parcels may experience extended delivery times due to customs inspections and carrier handling procedures.

Documentation: Proper documentation accompanies all shipments to ensure compliance with international shipping regulations.