Specification Sheet: JBD 4s

JBD 4s (12 Volt) BMS Units

Basic Properties
Model150A
Cell ChemistryLiFePO4 (LFP)
Pack Structure4s (12.8v Nominal)
Nominal Voltage Per Cell3.2v
Operation ModeCommon Port
Number of Temperature Sensors
2 External (Battery Temp)
1 Internal (MOSFET Temp)
Cell Monitoring Harness Wire Guage24 AWG
P- / C- Connection Type
M6 Threaded Terminal
2 each (4 total)
Default Charge Protection Parameters
Rated Continuous Charge Current150A
Charge Over-Current Protection
Trip Delay: 10 seconds
Trip: 160A
Release: 32 second delay
Cell Over-Charge Protection
Trip Delay: 2 seconds
Trip: 3.65v
Release: 3.5v
Pack Over-Charge Protection
Trip Delay: 2 seconds
Trip: 14.6v
Release at 14.0v
High-Temperature Protection
Trip Delay: 2 seconds
Trip: 65°C (146°F)
Release: 55°C (131°F)
Low-Temperature Protection
Trip Delay: 2 seconds
Trip: 0°C (32°F)
Release: 5°C (41°F)
Default Discharge Protection Parameters
Rated Continuous Discharge Current150A
Discharge Over-Current Protection
Trip Delay: 10 seconds
Trip: 160A
Release: 32 second delay
Cell Over-Discharge Protection
Trip Delay: 2 seconds
Trip: 2.5v
Release: 2.75v
Pack Over-Disharge Protection
Trip Delay: 2 seconds
Trip: 10v
Release at 12v
High-Temperature Protection
Trip Delay: 2 seconds
Trip: 75°C (167°F)
Release: 65°C (146°F)
Low-Temperature Protection
Trip Delay: 2 seconds
Trip: -20°C (-4°F)
Release: -10°C (14°F)
Short-Circuit Protection
Trip Delay: 400µs
Trip: 890A
Release: 5 second delay
Default Cell-Balancing Parameters
Balance TypePassive Balancing
Balance Start Cell Voltage3.40v
Balance Accuracy
15mv (0.015v)
Adjustable 0-250mv
Additional Features & Parameters
  • Cell Cycle Counter
  • SOC % Monitoring
  • Bluetooth Connectivity
  • BMS Power Consumption
    • In-Operation: 20ma
    • Sleep or tripped state: 200µa

All parameters are adjustable. Most parameters may be easily adjusted via the Bluetooth app, however, some adjustments may only be made through the PC programming software.

All parameters have a tolerance of ± 2%

Full Feature List:

  • Includes USB Monitoring & Programming Cable for customizing setpoints and extended status monitoring.
  • Over Voltage Protection: If any cell(s) in your pack exceeds a safe voltage, the BMS will stop charging current from passing through, but will allow loads to draw power from the BMS without needing to be manually reset.  The BMS will automatically reset when voltages fall back within a safe range allowing for charging.
  • Under Voltage Protection: If any cell cells(s) in your pack fall below a safe voltage, the BMS will stop power from being removed from your battery pack, while simultaneously allowing charge current to enter to bring the cells above the minimum safe voltage.
  • Over Current & Short Circuit Protection: If you accidently draw too much power from your batteries, the BMS will interrupt this current, preventing damage to your batteries.
  • Under Temperature Protection: LiFePO4 batteries cannot be charged below 0° C (32° F). This BMS will disable charging when temperatures are too low, and automatically re-enable charging when temperatures are back within safe limits.  Limits may be adjusted using USB Programming Cable.
  • Over Temperature Protection: This BMS will completely turn off if the temperature probe(s) detect temperatures in excess of 75° C (167°F), preventing damage to batteries in high-heat applications.
150A Model: Heat-Sink Plate Dimensional Drawing
150A Model: Bottom Layer PCB Routing Diagram
150A Model: Top Layer PCB Routing Diagram