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2S 20A BMS Lithium Battery Protection Board with Cell Balancing (7.4V / 8.4V)

K-TECHNICS
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KSh280.00

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Building a multi-cell lithium battery pack requires strict voltage management, and the 2S 20A Battery Management System (BMS) is the critical brain your project needs. Designed specifically for two-cell (2S) 18650 or LiPo configurations, this board serves as a comprehensive safety shield. It actively monitors the battery pack to prevent catastrophic damage from overcharging, deep discharging, overcurrent draws, and accidental short circuits.

What sets this specific board apart from basic protection circuits is its integrated cell balancing feature. In series configurations, batteries inevitably charge and discharge at slightly different rates. The onboard balancing circuitry safely bleeds off excess voltage from the highest-charged cell, ensuring both cells reach exactly 4.2V simultaneously. This prevents one cell from taking all the strain, dramatically extending the overall lifespan and usable capacity of your power bank.

Key Features & Functional Advantages:

  • High-Current Handling: Capable of sustaining a continuous discharge current of up to 20 Amps, making it tough enough to handle the sudden power spikes of DC motors and heavy mechanical loads.

  • Active Cell Balancing: Features integrated balancing resistors that continuously equalize the voltage between the two series cells during the final charging phase, maximizing total pack capacity.

  • Comprehensive Safety Suite: Automatically cuts off the circuit if a cell drops dangerously low (preventing permanent chemistry damage) or if voltage spikes too high (preventing thermal runaway and fires).

  • Short Circuit Protection: Instantly breaks the connection if a hard short circuit is detected on the output, safeguarding both your electronics and your immediate environment.

  • Low-Profile Footprint: The extremely compact PCB design allows it to be easily heat-shrinked directly onto a pair of 18650 cells without adding unnecessary bulk to your enclosure.

Perfect For:

  • Power Tool Battery Rebuilds: The ideal replacement BMS for resurrecting dead 7.2V/7.4V cordless drill, screwdriver, and rotary tool battery packs.

  • Custom Robotics & RC: Provides safe, sustained high-amperage power to 12V-class motor drivers, servos, and robotic chassis operating on a 2S power plan.

  • Portable Audio Systems: Protects the internal lithium power supply inside custom-built Bluetooth speakers and portable amplifiers.

  • High-Power LED Arrays: Ensures stable, safe power delivery to portable floodlights, biking headlamps, and heavy-duty flashlight mods.

Technical Specifications:

  • Configuration: 2S (2 Cells in Series)

  • Supported Chemistry: Lithium-Ion (18650, 21700) or Lithium Polymer (LiPo)

  • Nominal Voltage: 7.4V

  • Full Charge Voltage: 8.4V (Requires an 8.4V CC/CV charger)

  • Maximum Continuous Discharge Current: 20A

  • Overcharge Detection Voltage: 4.25V to 4.35V (per cell)

  • Over-discharge Detection Voltage: 2.5V to 3.0V (per cell)

  • Balancing Current: ~45mA

  • Approximate Dimensions: 46 mm x 20 mm x 3 mm

Ensure your order is placed by 2PM to guarantee next-day delivery! Our commitment to prompt service includes a 24-hour delivery system through our network of carriers, aimed at ensuring your package arrives right on schedule.

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.