TDT 3S-10AMP NMC ( Without Balancing ) HARDWARE BMS (8624)

1. Product Overview

The TDT-3S-8624 is a compact Battery Management System and protection board designed for three lithium-ion cells or parallel cell groups connected in series.

It is suitable for compatible lithium-ion and NMC cells having a maximum charging voltage of 4.2V per cell. A completed 3S battery pack has a nominal voltage of approximately 10.8V–11.1V and a maximum charging voltage of 12.6V.

The board includes separate battery connections marked B−, B1, B2 and B+, along with P+ and P− external power connections. A pre-fitted black temperature-sensor lead provides temperature monitoring where supported by the board.

The board’s continuous-current, peak-current and charging-current ratings are not printed or verified and should not be assumed from its appearance.

2. Technical Specifications

3. Connection Points

These are the typical functions of the printed markings. Verify the exact connection arrangement and voltage sequence before installation.

4. Main Features

• Designed for three lithium-ion cells or parallel groups connected in series
• Compact PCB for installation inside compatible battery packs
• Separate intermediate connections for monitoring all three series groups
• Four visible power MOSFETs for charge and discharge switching
• Two low-resistance R005 current-sense resistors
• Pre-fitted temperature-sensor lead
• Separate P+ and P− external power terminals
• Suitable for battery manufacturing, replacement and repair work

The exact overcharge, over-discharge, overcurrent, short-circuit and temperature-protection thresholds are not specified.

5. Suitable Applications

This BMS may be suitable for compatible 3S lithium-ion battery packs used in:

• Portable electronic equipment
• Bluetooth speakers
• Rechargeable lighting systems
• Robotics projects
• RC equipment
• DIY electronics
• Small backup-power devices
• Battery repair and replacement work
• Custom 11.1V lithium-ion battery assemblies

Suitability depends on the battery chemistry, cell configuration, charging voltage, continuous current, peak current and required protection thresholds.

6. Battery and Charger Compatibility

Before purchasing or installing this board, verify:

• The battery contains exactly three series groups
• The cells are lithium-ion or NMC with a 4.2V maximum charging voltage
• The charger is designed for a 3S lithium-ion battery
• The charger output does not exceed 12.6V
• The required charging and discharge currents are within the verified board rating
• The B−, B1, B2 and B+ connection layout matches the battery assembly
• The P+ and P− connections match the intended charger and load arrangement
• The board dimensions fit inside the battery enclosure
• The required temperature-protection characteristics are supported

This board must not be used with a 3S LiFePO4 battery because LiFePO4 cells require different charging and protection-voltage thresholds.

7. Installation Guidance

• Check the voltage of every cell group before connecting the board.
• Ensure that all three series groups are closely voltage-matched.
• Identify every terminal from the PCB markings.
• Connect B−, B1, B2 and B+ in the correct voltage sequence.
• Verify every intermediate voltage using a multimeter.
• Connect the charger and load through the specified P+ and P− terminals.
• Position the temperature sensor securely against the battery cells.
• Use conductors suitable for the verified operating current.
• Insulate the PCB and all exposed electrical connections.
• Confirm the final pack voltage before connecting the charger or load.

8. Important Current-Rating Note

The current rating cannot be reliably determined from the number of MOSFETs or current-sense resistors alone.

Confirm the following with the supplier or through controlled testing before use:

• Continuous discharge-current rating
• Peak discharge-current rating
• Maximum charging current
• Overcurrent-protection threshold
• Short-circuit-protection behaviour
• Temperature-protection thresholds
• PCB and MOSFET temperature limits

Do not advertise or operate this board at a particular amperage unless the rating has been independently verified.

9. Safety Information

• Incorrect B1 or B2 wiring can permanently damage the BMS.
• Never connect the series terminals in the wrong sequence.
• Do not reverse the battery polarity.
• Do not short-circuit the battery or power terminals.
• Use only a compatible 12.6V lithium-ion charger.
• Do not exceed the verified current rating of the BMS or cells.
• Keep the PCB away from water, metal particles and conductive debris.
• Do not use a damaged, burnt, corroded or unusually hot board.
• Battery-pack assembly should be performed by someone familiar with lithium-ion battery wiring and safety.