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Green rectangular circuit board with alloy heatsink and yellow thermal pad, four-cell LiFePO4 BMS layout

Adafruit

Adafruit 4S LiFePO4 BMS Board 3.2V 300A Alloy PCB

SKU CH-13A7-518R1

A 4S 3.2 V LiFePO4 BMS board with alloy PCB, 300 A instantaneous current and protections against overcharge, overdischarge, overcurrent and short circuit

  • Protects four LiFePO4 cells with overcharge, overdischarge, overcurrent and short-circuit safeguards
  • Balances each cell at 3.5 V using 0.07 A balance current for longer pack life
  • Handles continuous loads of 50-150 A and instantaneous peaks up to 900 A
  • Charges at 14.6 V with 2-second overcharge delay at 3.65 V per cell
  • Alloy-plus-PCB construction keeps standby draw to 25 µA per cell

4S LiFePO4 Battery Management Board

This 4S 3.2V LiFePO4 BMS board is built for DIY battery packs and educational projects. It integrates overcharge, overdischarge, overcurrent and short-circuit protection on an alloy-plus-PCB assembly. The board arrives new and includes a cable board and yellow pad for immediate wiring. Hobbyists and students can use it to manage four-cell lithium iron phosphate configurations safely.

Protection Limits and Balance Performance

The module balances each cell at 0.07A once voltage reaches 3.5V, with a 3.6V instantaneous balance threshold and a 3.65V overcharge delay of two seconds. Overdischarge cutoff sits at 2.5V per cell and recovery activates at 3.0V automatically. Continuous charging current is rated 50-150A while instantaneous peaks of 300-900A are tolerated, though short-circuit survival is not guaranteed. Standby draw is only 25µA per cell.

Thermal Cut-Off at 75°C

A built-in over-temperature trigger shuts the board down at 75°C, making this the decisive spec for high-current or poorly ventilated installations. If your pack or inverter can push the PCB above that temperature, the BMS will disconnect and require a cool-down before recovery. Builders needing sustained operation beyond this thermal ceiling must add external cooling or choose a higher-rated controller.

Highlights

  • Protects four LiFePO4 cells with overcharge, overdischarge, overcurrent and short-circuit safeguards
  • Balances each cell at 3.5 V using 0.07 A balance current for longer pack life
  • Handles continuous loads of 50-150 A and instantaneous peaks up to 900 A
  • Charges at 14.6 V with 2-second overcharge delay at 3.65 V per cell
  • Alloy-plus-PCB construction keeps standby draw to 25 µA per cell

Specifications

No published specifications for this item yet.

Questions about this item

Will this 4S 3.2V BMS board work with my existing 14.6V charging setup?

The board is designed for a 14.6V charging voltage and supports a 50A to 150A charging current range, making it compatible with chargers configured for 4S LiFePO4 packs.

How can I confirm the board is balancing cells correctly after installation?

Each cell should settle at the 3.5V balance voltage with a 0.07A balance current; the board enters balance mode automatically when cells reach 3.6V and stops at 3.5V.

Does the package include the yellow insulation pad and cable board, or must I buy them separately?

The package list shows one cable board and one yellow pad are included, so no separate purchase is required for those items.

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