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Car Audio Discussion
General Car Audio
what Car Batteries do I need to buy for competition system
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<blockquote data-quote="bbeljefe" data-source="post: 8204135" data-attributes="member: 655960"><p>Internal resistance and short circuit amperage are insignificant for a variety of reasons.</p><p></p><p>First of all, all batteries have internal resistance and that value is not a constant, repeatable number. Moreover, ESR increases in all batteries as they age and, again, that increase is neither constant nor predictable with any degree of accuracy from one cell to the next, let alone from one battery to the next. Second, we don't short batteries when we use them. Thus, the fact that one battery has a short circuit current rating that's 25% higher than the next, is irrelevant to this discussion.</p><p></p><p>Let's take an example of one $450.00 car audio battery and two $160.00 AGM batteries and for the sake of discussion, let's assume the CA battery to have 25% lower initial ESR and 25% higher SCC. And let's assume that the CA battery is a 125AH and the typical AGMS are 105AH.</p><p></p><p>The two typical AGMs cost 29% less than one CA battery and they provide 40% more current. All other things being equal, the ESR difference might net you 2/10 of a volt at the amplifier assuming that the ESR of the CA battery's cells never increases or, more realistically, that it increases in concert with those of the typical AGMs throughout it's life span. As for short circuit current, it doesn't doesn't indicate an appreciable increase in current capacity to the CA battery. What it is useful for is determining whether or not the case it's in is capable of withstanding a short circuit safely. That's something that manufacturers are concerned with, not bassheads who fuse at hundreds of amps less than that number.</p></blockquote><p></p>
[QUOTE="bbeljefe, post: 8204135, member: 655960"] Internal resistance and short circuit amperage are insignificant for a variety of reasons. First of all, all batteries have internal resistance and that value is not a constant, repeatable number. Moreover, ESR increases in all batteries as they age and, again, that increase is neither constant nor predictable with any degree of accuracy from one cell to the next, let alone from one battery to the next. Second, we don't short batteries when we use them. Thus, the fact that one battery has a short circuit current rating that's 25% higher than the next, is irrelevant to this discussion. Let's take an example of one $450.00 car audio battery and two $160.00 AGM batteries and for the sake of discussion, let's assume the CA battery to have 25% lower initial ESR and 25% higher SCC. And let's assume that the CA battery is a 125AH and the typical AGMS are 105AH. The two typical AGMs cost 29% less than one CA battery and they provide 40% more current. All other things being equal, the ESR difference might net you 2/10 of a volt at the amplifier assuming that the ESR of the CA battery's cells never increases or, more realistically, that it increases in concert with those of the typical AGMs throughout it's life span. As for short circuit current, it doesn't doesn't indicate an appreciable increase in current capacity to the CA battery. What it is useful for is determining whether or not the case it's in is capable of withstanding a short circuit safely. That's something that manufacturers are concerned with, not bassheads who fuse at hundreds of amps less than that number. [/QUOTE]
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what Car Batteries do I need to buy for competition system
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