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HXYP-4S-3828 4S 8A BMS Lithium Battery Protection Board (14.8V / 16.8V)

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When building custom 4-cell series (4S) lithium-ion packs, space is often at a premium, but safety cannot be compromised. The HXYP-4S-3828 BMS Protection Board is specifically engineered to provide comprehensive protection for 14.8V battery configurations without the bulk of heavy industrial modules. Designed to sustain a reliable 8 Amps of continuous discharge, it is the perfect middle-ground module for powering moderate loads like custom LED arrays, small robotics, and portable audio setups.

This board acts as a diligent gatekeeper for your power supply. While it hums along smoothly at 8A continuous, its standout feature is the hard 20A instantaneous current limit. If a motor stalls or a short-circuit occurs causing a massive spike in current draw, the board instantly trips to sever the connection, preventing melted wires, thermal runaway, and catastrophic cell damage. Once the fault is cleared, the board resets, keeping your equipment safe and operational.

Key Features & Functional Advantages:

  • 8A Continuous / 20A Limit: Perfectly calibrated to handle steady 8-Amp loads, with a strict 20A over-current cut-off threshold to safeguard against sudden electrical faults.

  • Compact Integration: Measuring just 38mm by 28mm, its low-profile PCB design allows it to be easily shrink-wrapped directly alongside an 18650 square-pack or flat-pack.

  • Comprehensive 4-Tier Protection: Actively monitors the cells to prevent over-charging, deep over-discharging (below 2.5V), over-current events, and hard short-circuits.

  • Low Internal Resistance: Utilizes high-quality MOSFETs to ensure minimal power loss and reduced heat generation during normal operation.

  • Automatic Fault Recovery: If the protection circuit is triggered by an anomaly (like a momentary short), the system restores output once the load is disconnected and normal charging voltage is applied.

Perfect For:

  • Portable LED Lighting: Safely regulates custom 14.8V power banks built specifically to drive high-wattage field lighting and camera floodlights.

  • Small-to-Medium Robotics: An excellent power management brain for 12V-14V tabletop rovers, motorized sliders, and micro-actuators that don't require heavy-duty 40A boards.

  • Custom Audio Enclosures: Protects the internal lithium power supplies of DIY Bluetooth speakers and portable desktop amplifiers.

  • Sensor & IoT Networks: Provides steady, protected power from 4S packs used as off-grid power reserves for remote environmental telemetry nodes.

Technical Specifications:

  • Model: HXYP-4S-3828

  • Configuration: 4S (4 Cells in Series)

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

  • Nominal Voltage: 14.8V

  • Full Charge Voltage: 16.8V (Requires a dedicated 16.8V CC/CV lithium charger)

  • Maximum Continuous Discharge Current: 8A

  • Over-Current Protection Threshold (Limit): 20A (± 2A)

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

  • Over-Discharge Cut-off Threshold: ~2.50V ±0.08V per cell

  • Approximate Dimensions: 38 mm x 28 mm x 3 mm

  • Connection Pads: B- (Battery Negative), B1, B2, B3, B+ (Battery Positive) / P- (Load Negative), P+ (Load Positive)

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.