• Purpose: It measures the battery's ability to maintain voltage while under stress, rather than just measuring raw voltage, which indicates actual capacity.
• Mechanism: A pulse load tester briefly draws a high current (similar to a starter motor) and monitors the voltage drop and recovery.
• Key Techniques:
  • HPPC (High Power Pulse Characterization): A standard test for electric vehicles that applies current pulses to determine power density and internal resistance.
  • Electrochemical Dynamic Response (EDR): Measures the mobility of ions between electrodes by evaluating how quickly the voltage recovers after a pulse, identifying weak or "soft" batteries.
• Parameters Tested:
  • State of Health (SOH): Determines aging, often caused by sulfation.
  • Internal Resistance (IR): Higher resistance means lower performance, especially during high-demand events.
  • Voltage Recovery: A healthy battery recovers quickly from a pulse; a weak one is sluggish.

• "Real World" Simulation: Mimics actual operating conditions better than simple voltage checks.
• Speed: Provides rapid assessment of battery condition.
• Application: Ideal for electric vehicle batteries, hybrid vehicles, grid storage, and consumer electronics.
• Diagnostic Tools: Uses specialized equipment that indicates results, often with LED lights indicating "Strong" (green), "Weak" (yellow), or "Fail" (red).

Key Types of Pulse Testing

• Hybrid Pulse Power Characterization (HPPC): A standard industry test used to determine a battery’s dynamic power capability, internal resistance (DCIR), and usable energy across different States of Charge (SOC).
• Pulse Load Testing: Often used in "cell checkers" for car or alarm batteries. It verifies if a battery can maintain voltage under a simulated load rather than just measuring its static voltage.
• Galvanostatic Intermittent Titration Technique (GITT): A series of current pulses followed by relaxation periods used to retrieve thermodynamic and kinetic parameters, such as the chemical diffusion coefficient.

Why Use Pulse Testing?

1. Internal Resistance (DCIR) Calculation: By measuring the instantaneous voltage drop (ΔV) at the onset of a pulse and the current change (ΔI), engineers calculate the Direct Current Internal Resistance (R = ΔV  / ΔI ).
2. State of Health (SOH) Assessment: Monitoring how quickly a battery voltage recovers after a pulse (recovery time) can indicate aging or sulfation in lead-acid batteries.
3. Real-World Simulation: It tests the battery's ability to handle high-drain devices (like power tools or e-cigarettes) where current is drawn in 1- to 10-second pulses rather than continuously.
4. Battery Recovery: "Pulse repair" chargers use high-frequency pulses to break down sulfate crystals on the plates of older lead-acid batteries to restore capacity.