Lithium Battery Charger Protection Module (BMS) 3S (12.6V – 25A )

3S Lithium Battery Charger Protection Module (BMS) – 12.6V 25A

This 3S BMS (Battery Management System) is designed to protect and manage 3-cell lithium-ion or lithium-polymer battery packs connected in series (3S = 11.1V nominal, 12.6V fully charged). Rated for up to 25A continuous discharge, this module ensures safe charging, discharging, and battery health in medium-load applications like power banks, DIY tools, robotics, and e-mobility projects.

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🔧 Key Features

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

• Nominal Voltage: 11.1V

• Full Charge Voltage: 12.6V (4.2V × 3)

• Max Continuous Discharge Current: 25A

• Charging Current: Up to 10A (recommended)

• Control Functions:

  • Overcharge protection

  • Over-discharge protection

  • Overcurrent protection

  • Short-circuit protection

  • Cell voltage balancing (optional based on model)

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📐 Technical Specifications

• Overcharge Protection Voltage: ~4.25V ± 0.05V per cell

• Over-discharge Protection Voltage: ~2.8V ± 0.1V per cell

• Overcurrent Protection: 25A (may support bursts >40A)

• Short-circuit Protection: Yes (auto-recovery or reset required)

• Operating Temperature: –40°C to +85°C

• Board Dimensions: Approx. 50mm × 25mm × 3mm

• Connection Pads: B+, B–, B1, B2, P+, P–

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🛠️ Connection Guide

🔋 Battery Wiring (3S Pack)

⚡ Load & Charger Wiring

• P+ → Connect to positive of load/charger

• P– → Connect to negative of load/charger

⚠️ Important: Always connect battery terminals first, then load/charger. Incorrect wiring may permanently damage the BMS.

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🧰 Applications

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

• RC cars, robotics, and drones

• DIY power tools or e-bike packs

• Solar energy storage and backup power

• Portable electronics and power banks

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✅ Benefits

• Provides safe operation and extends battery lifespan

• Supports up to 25A for mid-power applications

• Compact design fits into most battery enclosures

• Easy integration with chargers and load systems

• Protects against battery damage and overheating