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SportTrac Discussion
Electrical
charge battery or replace it?
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<blockquote data-quote="Robert Howell" data-source="post: 1014299" data-attributes="member: 70748"><p>Ohm's law states that if the resistance remains the same (the starter) and current drops as is the case with an old sulfated battery then voltage also drops. This is why the battery is tested with a carbon pile, we can vary the resistance of the load to get half the rated CCA current across the pile for 15 seconds. The battery passes if it maintains 9.6 volts or better, if not, it is weak. </p><p></p><p> Eddie is correct that a weak battery that is unable to deliver the correct current has a larger voltage drop, the starter turns slower and actually draws more amperage at a lower voltage. This does tend to overheat the starter and shorten it's life.</p></blockquote><p></p>
[QUOTE="Robert Howell, post: 1014299, member: 70748"] Ohm's law states that if the resistance remains the same (the starter) and current drops as is the case with an old sulfated battery then voltage also drops. This is why the battery is tested with a carbon pile, we can vary the resistance of the load to get half the rated CCA current across the pile for 15 seconds. The battery passes if it maintains 9.6 volts or better, if not, it is weak. Eddie is correct that a weak battery that is unable to deliver the correct current has a larger voltage drop, the starter turns slower and actually draws more amperage at a lower voltage. This does tend to overheat the starter and shorten it's life. [/QUOTE]
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SportTrac Discussion
Electrical
charge battery or replace it?
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