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<blockquote data-quote="Thnking" data-source="post: 2411397" data-attributes="member: 571105">Specs don&#039;t have any meaning with simple numbers when it comes to batteries.&nbsp; An ESR rating for example, is taken at a specific temperature at a specific frequency at a specific discharge rate.&nbsp; Placing that number into the real world, shows it&#039;s insignificant to how the ESR of a battery changes as the conditions change.&nbsp; Differently structured batteries have different ESR curves.When someone is trying to determine how many batteries they need to run a stereo off of a bank of batteries, looking at the AH rating isn&#039;t going to be helpful.&nbsp; If someone is serious about this they are going to take a clamp and average the readings over a period.&nbsp; Yes it’s going to vary song to song and volume to volume and time to time, but there is usefulness depending on the situation.&nbsp;&nbsp; Competing with banks for example.I also never said someone should expect their capacity to be on the money with music, obviously it&#039;s going vary.&nbsp; You’re incorrectly applying what I said about using Peukerts formula to a standard with every situation in terms of battery capacity.&nbsp; But if someone is going to select the # of batteries vs. anticipated current draw vs anticipated time, Peukerts formula is a necessity.&nbsp; No spec can identify this better than Peukerts formula.</blockquote>

[QUOTE="Thnking, post: 2411397, member: 571105"] Specs don't have any meaning with simple numbers when it comes to batteries. An ESR rating for example, is taken at a specific temperature at a specific frequency at a specific discharge rate. Placing that number into the real world, shows it's insignificant to how the ESR of a battery changes as the conditions change. Differently structured batteries have different ESR curves. When someone is trying to determine how many batteries they need to run a stereo off of a bank of batteries, looking at the AH rating isn't going to be helpful. If someone is serious about this they are going to take a clamp and average the readings over a period. Yes it’s going to vary song to song and volume to volume and time to time, but there is usefulness depending on the situation. Competing with banks for example. I also never said someone should expect their capacity to be on the money with music, obviously it's going vary. You’re incorrectly applying what I said about using Peukerts formula to a standard with every situation in terms of battery capacity. But if someone is going to select the # of batteries vs. anticipated current draw vs anticipated time, Peukerts formula is a necessity. No spec can identify this better than Peukerts formula. [/QUOTE]

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