HXYP-2S-A18 18650 2S 4A BMS Lithium-Ion Protection Board with Cell Balancing (7.4V / 8.4V)

The HXYP-2S-A18 18650 2S 4A BMS is a highly capable, "enhanced" battery management system designed specifically for two-cell (2S) 18650 lithium-ion battery packs. While many micro-BMS boards cap out at a strict 3 Amps and lack cell equalization, this enhanced module steps up the performance. It safely sustains a 4 Amp continuous discharge rate, providing that extra bit of overhead needed for slightly more demanding DC motors, brighter LED arrays, and punchier audio amplifiers without constantly tripping the over-current protection.

The standout feature of this specific board is its integrated active cell balancing circuitry. When two cells are wired in series, they naturally drift apart in voltage over multiple charge cycles. If left unchecked, one cell will overcharge while the other starves, killing the battery pack prematurely. This board actively bleeds off excess voltage from the faster-charging cell, ensuring both 18650s hit exactly 4.2V at the exact same time. This guarantees you get the maximum possible runtime and cycle life out of your custom battery builds.

Key Features & Functional Advantages:

• 4A Continuous Discharge: Provides reliable, steady power delivery for low-to-medium drain devices, with overhead to handle minor motor start-up spikes.

• Integrated Cell Balancing: Automatically equalizes the voltage between the two series-connected cells during the final phase of charging, preventing premature pack degradation.

• 4-Tier Protection Suite: Constantly monitors the pack to instantly sever the connection in the event of over-voltage (over-charging), under-voltage (deep discharging), over-current, or a hard short-circuit.

• Enhanced MOSFETs: Built with upgraded, low-resistance MOSFETs that reduce heat generation and improve overall efficiency compared to standard, budget-tier 2S boards.

• Compact PCB Footprint: Designed to sit cleanly across the bridge of two side-by-side 18650 cells, making it incredibly easy to heat-shrink into a clean, professional-looking custom pack.

Perfect For:

• Upgraded Portable Audio: Protects the internal 7.4V lithium power supply inside mid-wattage DIY Bluetooth speakers and desktop radios.

• Custom LED Lighting: Safely regulates power for portable 7.4V LED video lights, headlamps, and outdoor camping lanterns.

• Small RC Toys & Robotics: Provides safe, steady voltage to 7.4V DC gear motors and servos found in tabletop rovers and custom STEM robotics.

• Replacing Dead BMS Boards: An excellent, drop-in upgrade for repairing the internal battery packs of older 7.4V shavers, clippers, and low-power handheld vacuums.

Technical Specifications:

• Model: HXYP-2S-A1818650

• 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 lithium charger)

• Maximum Continuous Current: 4A

• Peak / Transient Current: ~5A to 8A (Brief spikes)

• Overcharge Detection Voltage: 4.25V to 4.35V (±0.05V) per cell

• Over-Discharge Detection Voltage: 2.5V to 3.0V (±0.05V) per cell

• Balancing Current: ~45mA

• Approximate Dimensions: ~34 mm x 17 mm x 3 mm (Dimensions can vary slightly by manufacturer batch)

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.