A 3S (3-series) battery protection module designed for connecting three 18650 or polymer lithium-ion cells in series to create a 12 V rechargeable battery pack. The board provides overcharge, over-discharge, overcurrent, and short-circuit protection to safeguard your battery pack during charging and discharging.

With a maximum continuous current of 5–8 A and transient current of 9–10 A, this compact module is suitable for solar lighting, backup power supplies, and other portable power applications.

Key Features

• 3S Configuration – Supports three 18650 or polymer lithium cells in series
• Full Protection Suite – Overcharge, over-discharge, overcurrent, and short-circuit protection
• Self-Recovery Short-Circuit Protection – Automatically resets after a short-circuit event
• Ultra-Low Quiescent Current – Less than 6 μA for minimal standby drain
• Low Internal Resistance – Less than 60 mΩ for efficient power delivery
• Compact Board – Just 50 × 16 × 1.0 mm

Specifications

• Model: HX-3S-01
• Rated Voltage: 10.8 V (polymer) / 11.1 V (18650 Li-Ion) / 12.6 V (fully charged)
• Max Working Current: 5–8 A
• Transient Current: 9–10 A
• Overcharge Voltage: 4.25–4.35 V ±0.05 V (per cell)
• Over-Discharge Voltage: 2.3–3.0 V ±0.05 V (per cell)
• Quiescent Current: < 6 μA
• Internal Resistance: < 60 mΩ
• Working Temperature: -40°C to +50°C
• Storage Temperature: -40°C to +80°C
• Dimensions: 50 × 16 × 1.0 mm

Ideal For

• Solar street lamp battery packs
• Monitoring and backup power supplies
• DIY 12 V portable battery packs
• Custom power systems for robotics and electronics

Package Contents

• 1× 18650 battery protection module (12 V 10 A)