1. If the measurement is made with the battery installed on the vehicle, turn off the ignition and disconnect the ground cable from the battery (grounding). Before measurement, the battery must not be under load for at least two hours. During these two hours, the battery should also not be charged.
2. Attach a voltmeter to the battery terminals. All consumers must be turned off.
3. If the meter shows 12.5 volts or more, then the battery is good. The following table shows the relationship between quiescent voltage and battery condition.
Voltage (IN) | 12.66 or more | 12,48 | 12,3 |
Battery is charged | 100% | by 70% | by 50% |
4. However, if after filling the electrolyte and charging the battery, the open circuit voltage does not exceed 12.5 volts, then the battery must be replaced. The voltage measurement between the pole clamps must be carried out several times!
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