Product Name

4S-7S 30A Li-ion Battery Management System (BMS) Protection Board 12V-24V with Balance Function

Product Overview

The Maxkgo 4S-7S 30A Li-ion Battery Protection Board is a compact and reliable battery management solution designed for multi-cell lithium-ion battery packs.

Supporting 4S to 7S Li-ion battery configurations (12V-24V), this BMS provides comprehensive protection including overcharge protection, over-discharge protection, over-current protection, short-circuit protection, temperature protection, and cell balancing.

With a compact design and low power consumption, it is suitable for applications requiring safe and efficient battery management, including electric mobility devices, DIY battery packs, robotics, portable power systems, and custom lithium battery applications.

Key Features

Multiple Battery Cell Compatibility

Supports:

• 4S Li-ion battery packs
• 5S Li-ion battery packs
• 6S Li-ion battery packs
• 7S Li-ion battery packs

Voltage range:

12V – 24V lithium battery systems

Complete Battery Protection Functions

The BMS integrates multiple protection mechanisms:

Overcharge Protection

Prevents lithium battery cells from charging beyond safe voltage limits.

• Detection voltage:
  25 ± 0.025V
• Release voltage:
  15 ± 0.05V
• Detection delay:
  1000 ± 500ms

Over-Discharge Protection

Protects battery cells from excessive discharge damage.

• Detection voltage:
  75 ± 0.1V
• Release voltage:
  0 ± 0.1V
• Detection delay:
  1000 ± 500ms

Over-Current Protection

Provides protection against excessive discharge current.

• Continuous discharge current:
  30A
• Protection current:
  50 ± 8A
• Detection voltage:
  50 ± 15mV

Short Circuit Protection

Fast response protection against accidental external short circuits.

• Detection delay:
  300μs
• Release condition:
  Disconnect the load

Cell Balancing Function

Built-in passive balancing improves battery pack consistency and extends battery lifespan.

• Balance detection voltage:
  15 ± 0.025V
• Balance current:
  42 ± 5mA
• Detection delay:
  100 ± 50ms

Temperature Protection

Integrated temperature monitoring protects the battery system under extreme conditions.

• Over-temperature protection:
  55°C
• Recovery temperature:
  75°C
• Operating temperature:
  -30°C to +80°C

Technical Specifications

Applications

This 4S-7S BMS protection board is suitable for:

• DIY lithium battery packs
• Electric skateboards
• E-bike battery systems
• Robotics platforms
• Portable power solutions
• RC and hobby projects
• Custom battery-powered devices
• Low-voltage electric mobility applications

Why Choose Maxkgo BMS Solution?

✅ Compact PCB design for space-limited applications
✅ Multi-cell Li-ion battery compatibility
✅ Multiple safety protection functions integrated
✅ Low standby power consumption
✅ Reliable battery monitoring and protection
✅ Suitable for OEM/custom battery applications

Package Includes

• 1 × 4S-7S Li-ion BMS Protection Board
• 1 × HY2.0 Single-head 8P Cable