3S 20A BMS 18650 Lithium Battery Protection Board 11.1V 12V 12.6V

✅ Product Description:

3S 20A BMS 18650 Lithium Battery Protection Board 11.1V 12V 12.6V with Balance

The 3S 20A 18650 Lithium Battery Protection Board is designed to protect and manage 3-cell lithium battery packs (11.1V to 12.6V) used in applications such as electric drills, LED lighting, sprayers, and small inverters. Featuring auto recovery and built-in balance function, this board ensures extended battery life and safe performance.

This module supports a continuous discharge and charge current of up to 20A, and integrates 10 low-resistance MOSFETs for efficient thermal and electrical handling. It's compact and ideal for DIY battery packs using 18650, 26650, or lithium polymer cells.

Features:

• Supports 3S lithium battery packs (11.1V / 12V / 12.6V)

• Built-in balance function with 100mA balanced current

• Continuous charge/discharge current: 20A

• Integrated 10 MOS tubes for load efficiency

• Auto recovery function

• Ideal for electric drills with starting current < 80A and power < 135W

• Compact size: 59mm x 20mm x 4mm

Specifications:

• Battery Type: 3S (3 cells in series)

• Overcharge Detection Voltage: 4.25 ± 0.025V

• Over-discharge Voltage Range: 2.3 ~ 3.0 ± 0.05V

• Continuous Charge Current: 20A

• Operating Temperature: -40°C to +50°C

• Dimensions: 59mm x 20mm x 4mm

• Weight: 4g

Application Notes:

• Not suitable with standard 18650 cells for high-drain tools—use high C-rate cells only

• Strictly follow wiring sequence (0V, 4.2V, 8.4V, 12.6V)

• For motor applications, add a non-polar capacitor (25V+, 10uF–100uF) across terminals to prevent damage from voltage spikes

• Ensure all battery groups are fully charged and balanced before use

Package Includes:

• 1 x 3S 20A 18650 Lithium Battery Protection Board 11.1V 12V 12.6V

Note: Image shown is for representation only. Actual product may vary in design.