That’s where non-invasive test methods come in(See BU-904: How to Measure Capacity) Larger batteries are normally not cycled as this is time-consuming and stresses the battery. A periodic analysis ensures that the batteries are kept within an acceptable performance range and prompts replacement if the capacity is below a required target threshold and can no longer be raised. Measuring capacity by discharge gives the most reliable assessment, a method that is most effective with portable batteries. The battery is first charged and then discharged at a controlled current while measuring the time to reach the end-of-discharge point(See BU-402: What is the C-rate?) A capacity of 100 percent delivers the specified Ah 50 percent is shown if the discharge time is cut in half. The energy a battery holds can be measured with a battery analyzer by applying a full discharge.
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