Keywords: NiCd battery internal resistance measurement, battery testing methods, electrochemical impedance, industrial battery diagnostics
Introduction
Measuring internal resistance is one of the simplest yet most accurate ways to evaluate the health of a Ni-Cd battery. Here are the industry-approved methods used for testing.
Measurement Methods
1. Load Test (Voltage Drop Method)
A controlled load is applied, and the voltage drop is measured. Internal resistance = ΔV / I.
- Simple
- Accurate enough for field inspections
2. AC Impedance Testing
A small AC signal is sent through the battery to read impedance.
- Highly accurate
- Used in professional laboratories and maintenance centers
3. Pulse Load Testing
A short pulse load tests a battery’s ability to deliver high current.
- Ideal for aviation and UPS batteries
- Detects early failures
Recommended Tools
- Battery impedance testers
- Industrial multimeters
- Battery analyzers designed for Ni-Cd chemistry
Conclusion
Accurate internal resistance measurement allows early detection of aging and ensures the reliability of Ni-Cd battery backup systems.
