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.
| 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 |
14.4V (4S) Models:
18V (5S) Models:
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.
Before Installation:
Wiring Guidelines:
Required Skills:
Who Should NOT Attempt Installation:
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.
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.
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.
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.
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.