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10A 3S 11.1V Li-ion Battery Protection Board – 20A Peak Current, AOD403 + 8254AA Solution (BMS PCB for Lithium Packs)

SKU: FA2193-07-3
Compatible Battery

3S 11.1V lithium-ion
Full Charge Voltage

12.6V
Continuous Discharge Current

10A
Peak Discharge Current

20A
Protection Solution

AOD403 MOSFET + 8254AA IC
Overcharge Protection Voltage

~4.25V – 4.3V per cell
Over-discharge Protection Voltage

~2.5V – 3.0V per cell
Cell Balancing

Yes

The 10A 3S 11.1V Li-ion Battery Protection Board is a high-performance safety module designed to protect 3-cell (3S) lithium-ion battery packs from overcharge, over-discharge, and overcurrent conditions. Built around the AOD403 MOSFET and 8254AA protection IC solution, this BMS PCB offers 10A continuous and 20A peak current handling, making it suitable for demanding applications including power tools, e-bikes, RC vehicles, and energy storage systems.

At the heart of the board is a BMS (Battery Management System) protection circuit that continuously monitors the voltage of each cell and the total pack current, disconnecting the load or charger if any parameter exceeds safe limits. This protects both the battery pack and your connected devices from damage, extending battery lifespan and ensuring safe operation.

The board provides three critical protection functions:

  • Overcharge protection — Disconnects the charger when any cell voltage reaches approximately 4.25V to 4.3V, preventing damage from excessive charging.

  • Over-discharge protection — Disconnects the load when any cell voltage drops to approximately 2.5V to 3.0V, preventing deep discharge that can permanently damage the battery.

  • Overcurrent protection — Disconnects the output when current exceeds 10A continuous or 20A peak, protecting against short circuits and excessive loads.

The AOD403 MOSFET is a high-performance N-channel power MOSFET with low on-resistance (RDS(on)), ensuring efficient power delivery and minimal heat generation during high-current operation. Combined with the 8254AA protection IC, this solution provides reliable, fast-response protection for demanding 3S applications.

The 20A peak current rating provides a safety margin for brief current surges, making this board suitable for applications such as power tools, e-bikes, and RC vehicles that draw high inrush currents during startup or acceleration. The 10A continuous rating ensures reliable operation under sustained loads.

The board features a solder pad design that supports both direct soldering and spot welding. The exposed pads allow you to solder wires directly to the board, while also being compatible with spot-welded nickel strips for professional battery pack assembly. The board includes B+, B-, BM1, BM2 (mid-points), P+, and P- pads for battery and output connections.

Important Note: This protection board is designed for 3S (3-cell) 11.1V lithium battery packs. For other configurations, a different protection board or BMS should be used. Always verify the voltage and current ratings match your application before installation. Ensure all wiring and connections are rated for the maximum current your application will draw.

Whether you are building a high-current 3S battery pack, assembling an e-bike battery, or adding safety protection to a power tool, the 10A 3S 11.1V Li-ion Battery Protection Board provides a reliable, high-current solution. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or educational programs.

Features

  • 3S triple-cell protection — Manages three cells in series with cell balancing

  • AOD403 MOSFET — High-performance N-channel MOSFET with low on-resistance

  • 8254AA protection IC — Reliable, fast-response protection controller

  • 10A continuous / 20A peak current — High-current capability for demanding applications

  • Comprehensive protection — Overcharge, over-discharge, and overcurrent protection

  • Cell balancing function — Ensures even charge and discharge across all three cells

  • Solder pad design — Supports both direct soldering and spot welding

  • Wide application range — Power tools, e-bikes, RC vehicles, energy storage

Technical Specifications 

# Parameter Specification
1 Compatible Battery 3S 11.1V lithium-ion
2 Full Charge Voltage 12.6V
3 Continuous Discharge Current 10A
4 Peak Discharge Current 20A
5 Protection Solution AOD403 MOSFET + 8254AA IC
6 Overcharge Protection Voltage ~4.25V – 4.3V per cell
7 Over-discharge Protection Voltage ~2.5V – 3.0V per cell
8 Cell Balancing Yes

Usage

Getting Started

  1. Identify the battery pack terminals — Locate the positive (+), negative (-), and mid-point (BM1, BM2) terminals of your 3S battery pack.

  2. Connect the battery — Solder or spot weld the B+ pad to the pack positive terminal, B- pad to the pack negative terminal, BM1 to the first mid-point, and BM2 to the second mid-point.

  3. Connect the output — Solder your load or output wires to the P+ and P- pads on the protection board.

  4. Test the protection — Verify that the output voltage is present when the pack is within safe limits, and that the output disconnects when any cell voltage drops too low or rises too high.

  5. For high-current applications — Ensure all wiring and connections are rated for the maximum current your application will draw. Use appropriately sized wires and connectors.

Protection Thresholds (Typical)

Parameter Threshold Action
Overcharge ~4.25V – 4.3V per cell Disconnect charger
Over-discharge ~2.5V – 3.0V per cell Disconnect load
Overcurrent 10A continuous / 20A peak Disconnect output

Connection Points

Pad Function
B+ Battery pack positive terminal
B- Battery pack negative terminal
BM1 First mid-point between cells
BM2 Second mid-point between cells
P+ Protected output positive
P- Protected output negative

Typical Applications

  • Power tools — High-current protection for drills, saws, and other tools

  • E-bikes — Protect 3S battery packs in electric bicycles

  • RC vehicles — High-current protection for remote-controlled models

  • Energy storage systems — Protect 3S battery packs in solar storage

  • Portable power stations — High-current protection for portable power

  • Electric scooters — Safe power for personal mobility devices

  • Educational projects — Teaching battery safety and protection principles

Notes for Business Buyers

  • High-current capability — 10A continuous / 20A peak fills the gap between standard 3S boards and larger BMS systems.

  • Proven protection solution — AOD403 + 8254AA combination provides reliable, fast-response protection.

  • Cell balancing included — Ensures even charge and discharge for longer pack life.

  • Suitable for bulk purchasing — Ideal for battery pack assemblers, e-bike manufacturers, and educational institutions.

Q: What is the 10A 3S 11.1V Protection Board used for?

It is a high-current safety module that protects 3-cell lithium battery packs from overcharge, over-discharge, and overcurrent conditions, with cell balancing for even charge and discharge.

Q: What batteries are compatible with this board?

It is designed for 3S (3-cell) 11.1V lithium-ion battery packs with a full charge voltage of 12.6V.

Q: What is the continuous and peak discharge current?

The board supports 10A continuous and 20A peak discharge current.

Q: What is the AOD403 + 8254AA solution?

The AOD403 is a high-performance N-channel power MOSFET with low on-resistance. The 8254AA is a protection IC that provides fast-response overcharge, over-discharge, and overcurrent protection.

Q: What are the protection thresholds?

Overcharge protection activates at approximately 4.25V–4.3V per cell. Over-discharge protection activates at approximately 2.5V–3.0V per cell. Overcurrent protection activates at 10A continuous / 20A peak.

Q: What is the difference between B+/-, BM1/BM2, and P+/-?

B+ and B- connect to the pack positive and negative terminals. BM1 and BM2 connect to the mid-points between the three cells. P+ and P- provide the protected output to your load or charger.

Q: Does this board balance the cells?

Yes. The board includes cell balancing to ensure all three cells charge and discharge evenly, maximizing pack lifespan.

Q: Can I spot weld this board to the battery?

Yes. The board supports both direct soldering and spot welding. The exposed pads are compatible with spot-welded nickel strips.

Q: Can I use this board with a 2S or 4S battery pack?

No. This board is specifically designed for 3S (3-cell) 11.1V battery packs. For other configurations, a different protection board or BMS is required.

Q: Can I purchase in bulk for a product development project?

Yes. This protection board is suitable for both individual users and business purchasing, including battery pack assemblers, e-bike manufacturers, and educational institutions.

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