3S 20A Li-ion Battery Protection BMS Board for 3.7V NMC / 18650 Cells
Protect your rechargeable lithium-ion battery pack with the 3S 20A Li-ion Battery Protection Board (BMS). Designed for three lithium-ion cells connected in series, this compact protection board monitors battery voltage and current and helps protect the battery pack against overcharging, over-discharging, overcurrent, and short circuits.
Suitable for compatible 18650 lithium-ion cells with a nominal voltage of 3.6V or 3.7V per cell, this module is ideal for DIY electronics, robotics, 3D printers, and other battery-powered projects within its current rating.
Key Features
3S Battery Configuration: Designed for three lithium-ion cells connected in series.
20A Maximum Working Current: Suitable for compatible applications within the board's current rating.
Overcharge Protection: Helps prevent cells from exceeding their specified charging voltage.
Over-Discharge Protection: Helps protect cells from excessive discharge.
Overcurrent Protection: Disconnects the battery pack when an overcurrent condition triggers the protection circuit.
Short-Circuit Protection: Helps protect the battery pack and connected equipment from short circuits.
Compact PCB Design: Suitable for battery-powered DIY projects and electronic applications.
18650 Cell Compatibility: For compatible 3.6V or 3.7V nominal lithium-ion cells.
Product Specifications
Specification | Details |
Product Type | Li-ion Battery Protection BMS Board |
Configuration | 3S (3 cells connected in series) |
Compatible Battery Chemistry | Compatible lithium-ion / NMC |
Compatible Cell Type | 18650 and other compatible Li-ion cells |
Nominal Cell Voltage | 3.6V–3.7V |
Nominal Pack Voltage | 10.8V–11.1V |
Full-Charge Pack Voltage | 12.6V |
Maximum Working Current | 20A (stated) |
Overcharge Protection | Yes |
Over-Discharge Protection | Yes |
Overcurrent Protection | Yes |
Short-Circuit Protection | Yes |
Applications
Arduino and Raspberry Pi projects
DIY lithium-ion battery packs
Robotics and robot cars
3D printers and compatible equipment
Quadcopters and hobby projects, subject to current requirements
Portable electronics
Battery-powered DIY devices
Important Notes
Use only with three compatible lithium-ion cells connected in series (3S).
The full-charge voltage for a standard 3S lithium-ion pack is 12.6V.
Confirm the board's wiring diagram and terminal connections before installation.
The actual safe current depends on the board design, wiring, connectors, cooling, and battery-cell capabilities. Do not assume 20A is suitable for every installation.
Select cells with sufficient discharge-current capability for your application.
This is a protection board, not a substitute for a suitable lithium-ion battery charger.
Package Contents
1 × 3S Li-ion Battery Protection Board – 20A BMS PCB
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