3S 40A Li-ion Battery Protection BMS Board for 3.7V NMC Cells
Protect your rechargeable lithium-ion battery pack with the 3S 40A Li-ion Battery Protection BMS Board. Designed for a 3-series-cell battery pack, this Battery Management System (BMS) helps protect compatible lithium-ion batteries against overcharging, over-discharging, overcurrent, and short circuits.
Featuring low-resistance MOSFETs and a cell-balancing function, this board is suitable for battery-powered DIY electronics, electric tools, LED lighting, and other compatible applications.
Key Features
3S Battery Configuration: Designed for three lithium-ion cells connected in series.
40A Discharge Rating: Supports a stated continuous discharge current of up to 40A under suitable operating conditions.
Multiple Protection Functions: Helps protect against overcharge, over-discharge, overcurrent, and short circuits.
Cell Balancing: Provides a stated balancing current of 100mA to help balance the series-connected cells.
Low-Resistance MOSFETs: Designed to reduce conduction losses during battery discharge.
Rechargeable Battery Support: Suitable for compatible 3.7V nominal lithium-ion cells with a 4.2V full-charge voltage per cell.
Versatile Applications: Useful for battery packs in compatible power tools, sprayers, LED lights, and DIY projects.
Product Specifications
Specification | Details |
Product Type | Li-ion Battery Protection BMS Board |
Configuration | 3S (3 cells in series) |
Compatible Cell Chemistry | Compatible 3.7V nominal Li-ion/NMC cells |
Nominal Pack Voltage | 11.1V |
Fully Charged Pack Voltage | 12.6V |
Rated Continuous Discharge Current | Up to 40A, subject to operating conditions |
Balancing Current | 100mA (stated) |
MOSFETs | 10 low-resistance MOSFETs (stated) |
Protection Functions | Overcharge, over-discharge, overcurrent, short circuit |
Application | Rechargeable lithium-ion battery packs |
Applications
Electric drills and compatible power tools
Battery-powered sprayers
LED lighting systems
Compatible low-power inverters
DIY battery packs
Portable electronic equipment
Robotics and electronics projects
Important Notes
3S battery pack only: Use with three compatible cells connected in series.
Voltage compatibility: A standard 3S lithium-ion pack is 11.1V nominal and 12.6V when fully charged.
Current rating: The actual safe current depends on the board design, cooling, wiring, connectors, and battery cells. Do not assume the board can deliver 40A continuously in every installation.
Cell balancing: Confirm the board's wiring diagram and balancing specifications before use.
Inverter compatibility: A 400W inverter may draw more than 40A from an 11.1V battery after accounting for conversion losses. Verify the actual current requirements before connecting.
Safety: Incorrect wiring or incompatible cells can cause overheating, fire, or battery damage. Follow the board's connection diagram and use suitable cells, wiring, and fusing.
Package Contents
1 × 3S 40A Li-ion Battery Protection BMS Board
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