3S 12V 15A BMS 18650 Lithium Battery Protection Board

The 3S 12V 15A BMS Battery Protection Board is designed to manage and protect rechargeable lithium-ion battery packs assembled from three cells connected in series. It is suitable for compatible 18650 battery packs used in cordless hand drills, portable power tools, robotics, and other battery-powered equipment that requires a compact protection circuit.

A 3S lithium-ion pack has a nominal voltage of 11.1V and a fully charged voltage of 12.6V when using standard 3.7V nominal lithium-ion cells. The BMS monitors battery conditions and helps protect the pack against overcharging, excessive discharge, overcurrent, and short-circuit faults, depending on the board's specific design.

With a rated discharge current of up to 15A, this board can be used in suitable power-tool battery assemblies where the motor's normal operating current and startup current remain within the protection board's limits. Correct cell selection and wiring are essential for safe operation. The three series-connected cell groups should use compatible cells with matching chemistry, capacity, and condition.

The board is intended for battery-pack integration rather than use as a standalone power supply. It must be connected to the battery cells and output terminals according to the manufacturer's wiring diagram. A compatible 12.6V lithium-ion charging system is required for a standard 3S Li-ion pack. The BMS does not replace a suitable charger, correctly rated wiring, or appropriate battery assembly practices.

Features:

• Designed for 3S lithium-ion battery packs

• Compatible with suitable 18650 cell assemblies

• 15A rated discharge current

• Overcharge protection

• Over-discharge protection

• Overcurrent protection

• Short-circuit protection

• Suitable for compatible cordless power-tool batteries

• Compact PCB for battery-pack integration

Specifications:

• Product Type: Battery Management System / Protection Board

• Battery Configuration: 3S, three cell groups connected in series

• Battery Chemistry: Lithium-ion, subject to board compatibility

• Compatible Cell Type: 18650 lithium-ion cells

• Nominal Pack Voltage: 11.1V

• Fully Charged Pack Voltage: 12.6V

• Rated Discharge Current: 15A

• Protection Functions: Overcharge, over-discharge, overcurrent, and short-circuit protection, subject to the exact board version

• Charging System: Compatible 12.6V CC/CV charger for a standard 3S lithium-ion pack

• Application: Battery packs for cordless drills and other compatible equipment

Exact protection thresholds, charging current, balancing capability, temperature protection, and dimensions depend on the specific board revision. Confirm these details from the supplied product or manufacturer datasheet.

Applications:

• Cordless hand-drill battery packs

• Compatible portable power tools

• 3S 18650 lithium-ion battery assemblies

• DIY battery-pack projects

• Robotics and mobile robot platforms

• Portable electronic equipment

• Battery-powered workshop devices

• Custom 12V-class power systems