Storage battery condition tester utilizing low load current
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United States of America Patent
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-
Jan 12, 1988
Grant Date -
N/A
app pub date -
Jun 4, 1985
filing date -
Jun 4, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A condition tester for a storage battery that monitors the effect of internal battery resistance without drawing large currents. A switched load periodically draws a small current across the battery terminals. An AC voltage is produced at the battery terminals resulting from the oscillating current and the internal battery resistance. That small oscillating voltage is amplified, rectified and filtered to produce a DC voltage which depends upon the AC component. This DC voltage is subtracted from the nominal battery voltage and the difference is indicated by an appropriate meter. As the battery deteriorates its internal resistance increases causing the meter reading to decrease, thereby reflecting battery condition.
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