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3S 20A Li-ion Battery 18650 BMS Board 12.6V

K-TECHNICS
In stock
KSh400.00

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The 3S 20A 12.6V BMS (Battery Management System) is designed to protect and manage 3-cell series (3S) lithium-ion battery packs. It is compatible with 3.6V/3.7V lithium cells, including 18650, 26650, and lithium polymer batteries, making it ideal for DIY battery packs, power tools, solar projects, robotics, and portable power systems.

This protection board provides overcharge, over-discharge, overcurrent, and short-circuit protection, helping extend battery life and improve safety. It supports a maximum charging voltage of 12.6V and a continuous discharge current of 20A.


Key Features

  • Designed for 3S (12.6V) lithium battery packs

  • Compatible with 18650, 26650, and LiPo batteries

  • Continuous discharge current up to 20A

  • Overcharge protection

  • Over-discharge protection

  • Overcurrent and short-circuit protection

  • Low standby current consumption

  • Compact and lightweight design


Technical Specifications

Parameter

Specification

Battery Type

3S Li-ion / LiPo

Cell Voltage

3.6V / 3.7V per cell

Charging Voltage

12.6V

Continuous Output Current

20A

Max Output / Charging Power

252W

Board Size

64 × 20 × 3.4 mm

Material

Metal + PCB

Standby Current

12–24 µA

Conduction Resistance

10–14 mΩ

Operating Temperature

-40°C to +85°C

Protection Parameters

Protection

Typical Value

Overcharge Protection

4.25V/cell

Overcharge Recovery

4.16V/cell

Over-discharge Protection

2.5V/cell

Over-discharge Recovery

3.2V/cell

Overcurrent Protection

40A

Overcurrent Delay

10ms

Important Notes

  • Wire the board strictly according to the diagram: 0V → 4.2V → 8.4V → 12.6V. Incorrect wiring may damage the BMS.

  • After connecting the battery pack, charge the pack once to activate the board.

  • Use matched batteries with similar capacity and internal resistance for best performance and safety.

  • Do not mix new and old batteries in the same pack.

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Please note, a delivery fee of €4.99 applies for orders under €50. For those in remote areas, be aware that our couriers may apply an extra surcharge. This additional fee helps cover the costs of transporting your items to harder-to-reach locations.