SC Burglar Alarm Practice Questions - South Carolina Burglar Alarm Contractor Examination Exam

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Why is a loaded battery test more reliable than an open-circuit voltmeter reading when judging a sealed lead-acid standby battery?

Open-circuit voltage cannot be measured on a 12-volt battery Load testing is never permitted on alarm batteries A healthy SLA always reads 6.0 volts open-circuit A sulfated or aged battery can still read about 13 volts unloaded but collapse when the panel or a load tester draws current

Correct Answer:

A sulfated or aged battery can still read about 13 volts unloaded but collapse when the panel or a load tester draws current

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