JBD 7S-20AMP NMC Hardware BMS (Jiabaida HP07SA)

Jiabaida HP07SA 7S 20A Lithium-ion BMS

Model: P7S-20A-20A-B-V1.3

The Jiabaida (JBD) HP07SA 7S 20A BMS is a high-reliability Battery Management System designed specifically for 7S (7 cells in series) Lithium-ion / NMC battery packs with a nominal voltage of approximately 25.9V and a full charge voltage of 29.4V.

Built for stable performance and long battery life, this BMS provides hardware-level protection and automatic passive cell balancing without requiring Bluetooth connectivity or mobile app configuration. It is ideal for users who want a dependable, plug-and-play safety solution for medium-power lithium battery systems.

This model is widely used in 24V lithium battery packs for electric mobility, solar energy storage, portable power systems, power tools, and custom DIY battery builds.

Key Features & Working

Designed for 7S Lithium-ion / NMC Packs

Compatible with battery packs made from 18650, 21700, or similar 3.7V lithium-ion cells arranged in 7 series configuration.
Nominal pack voltage: ~25.9V
Full charge voltage: 29.4V

⚠ Not suitable for LiFePO4 (3.2V) battery packs.

20A Continuous Charge & Discharge Rating

Supports up to 20A continuous current, making it suitable for moderate-load applications such as:

• E-bikes

• Portable energy storage systems

• Solar backup batteries

• Power tools

• DIY lithium battery packs

If your system requires more than 20A continuous load, consider a higher current BMS (30A / 40A / 60A).

Complete Hardware-Level Protection

This BMS continuously monitors individual cell voltages, pack voltage, and current to prevent unsafe conditions.

Protection functions include:

• Overcharge Protection – Stops charging if any cell exceeds safe voltage limits
• Over-Discharge Protection – Cuts discharge when voltage drops below safe level
• Over-Current Protection – Protects battery during excessive load conditions
• Short Circuit Protection – Immediately disconnects output during fault
• Temperature Monitoring (if sensor connected)

These protections significantly improve battery safety, lifespan, and system reliability.

Passive Cell Balancing

The built-in passive balancing function ensures that all 7 cells maintain equal voltage levels during charging. This helps:

• Improve overall battery lifespan

• Maintain stable performance

• Prevent cell imbalance issues

• Reduce long-term degradation

Balancing happens automatically without any user intervention.

Technical Specifications

• Brand: Jiabaida (JBD)
• Model: HP07SA
• Version: P7S-20A-20A-B-V1.3
• Battery Type: Lithium-ion / NMC
• Configuration: 7S (7 cells in series)
• Nominal Voltage: 25.9V
• Full Charge Voltage: 29.4V
• Continuous Charge Current: 20A
• Continuous Discharge Current: 20A
• Balancing: Passive
• Protection: Overcharge, Over-discharge, Overcurrent, Short circuit
• Application Voltage Class: 24V Lithium Systems

Typical Applications

• 24V Lithium Inverter Batteries
• Electric Bicycles & Scooters
• Solar Energy Storage Systems
• Portable Power Stations
• DIY Lithium Battery Projects
• Robotics & Industrial Equipment

Why Choose This BMS?

• Trusted Jiabaida (JBD) quality
• Stable 20A performance for medium loads
• No app or Bluetooth required
• Reliable hardware protection
• Ideal for clean, professional lithium battery builds