posted
Been comparing some batteries for Street A and looking at specs and wondering what is the most important thing that I should be looking for?
What specs should I be looking at and what specs don't matter. This is obviously for spl so I need input from someone that really know what they are talking about.
In the battery size I'm looking for I've seen amp hours from 72-100ah at 20 Hr rate. Do ah (amp hour) really matter for spl use?
Or does CCA? I've found anything from 760-930cca but the battery with the lower CCA is 8 lbs heaver and has 20 more amp hour than the higher CCA that is lighter. But both batteries have same short circuit amps. That leads to my next question.
Or does short circuit amps matter? Everything I've found is about the same at 3300 amps.
And what is better and why, AGM, Sealed lead-acid or sub-colloid gel battery?
posted
Walmart batteries work the best. None of those specs matter. It's the color of the battery's internals that matters. Just open up a bunch of batteries at Walmart, and which ever one has the prettiest colors is the best one.
Hope this helps.
-------------------- Alejandro "Alex" Avila Sound Decision SPL Team - team captain http://www.sounddecisioninc.com Posts: 1374 | From: Montgomery, IL U.S.A | Registered: Jul 2000
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quote:Originally posted by Alemuthafukinjandro: Walmart batteries work the best. None of those specs matter. It's the color of the battery's internals that matters. Just open up a bunch of batteries at Walmart, and which ever one has the prettiest colors is the best one.
Hope this helps.
hahahahaha... Great Answer!!!
Unfortunately, everybody is all over the place with specifications. Amp hours really dont tell you much for SPL as it is a very low current 20hr test. CCA and CA dont help much either because they are 30 second tests at 0 and 32 degrees. Short Circuit tests are to 0 volts and measured in as little as 1 tenth of a second... not much help there either. For SPL, the number to have would be, how much current can the battery produce for 2 seconds at around 10v... unfortunately, there is no standard for this test, so you will never see it used by manufacturers. Another thing to consider is that some amps will continue to make power at a lower voltage than others, so you could have a scenario where one battery beats the other at 10v, but gets beat at 9v.
I get asked these questions all day long, and my suggestion has always been to find a team mate, or competitor you trust and get their opinion... share test results... etc. Fortunately this forum is a great place to do that
-------------------- Scottie Johnson Sound Pressure Technologies
-------------------- Team DD Belgium - Dieter 2004: 153.2dB @ dB-Drag Street A certified 2005: 156,5dB @ dB-Drag Street A certified / 159.1dB @ IDBL Stock 1 worldrecord 2006:157.5 dB @ dB-Drag Street A certified 2007: 158.2 dB Worldrecord Street A / 158.3 dB @ dB-Drag Street A certified 2008: Benelux dB-drag judge Posts: 639 | From: Belgium | Registered: Sep 2003
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posted
Unfortunately, everybody is all over the place with specifications. Amp hours really dont tell you much for SPL as it is a very low current 20hr test. CCA and CA dont help much either because they are 30 second tests at 0 and 32 degrees. Short Circuit tests are to 0 volts and measured in as little as 1 tenth of a second... not much help there either. For SPL, the number to have would be, how much current can the battery produce for 2 seconds at around 10v... unfortunately, there is no standard for this test, so you will never see it used by manufacturers. Another thing to consider is that some amps will continue to make power at a lower voltage than others, so you could have a scenario where one battery beats the other at 10v, but gets beat at 9v.
I get asked these questions all day long, and my suggestion has always been to find a team mate, or competitor you trust and get their opinion... share test results... etc. Fortunately this forum is a great place to do that [/QB][/QUOTE]
That's pretty much what I've gathered after looking at a ton of spec sheets. Specs are all over the place. I don't have a lot of money now and need to pick up a battery for less than $200 and looking for alternatives. Thanks for the input.
Posts: 1248 | From: elgin | Registered: Jan 2003
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quote:Originally posted by Team DD Belgium - Dieter: Internal resitance is important
I assume that lower resistance is better?
Correct, because it determines the voltage drop
-------------------- Team DD Belgium - Dieter 2004: 153.2dB @ dB-Drag Street A certified 2005: 156,5dB @ dB-Drag Street A certified / 159.1dB @ IDBL Stock 1 worldrecord 2006:157.5 dB @ dB-Drag Street A certified 2007: 158.2 dB Worldrecord Street A / 158.3 dB @ dB-Drag Street A certified 2008: Benelux dB-drag judge Posts: 639 | From: Belgium | Registered: Sep 2003
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posted
AH is a form of capacity tells how much energy(current) a battery can store and can be measured many ways. capacity is one of the big 3 factors needed to figure out most any power application. take 2 batteries with the same ir but different capacity the larger capacity would be able to do more and last longer doing it without needing a recharge. in many cases the higher capacity battery battery will have a lower ir of its smaller counterpart. Try to pull too much current from too small of a battery and it wont do it reguardless of its IR as the current a battery can hold is not infinate
-------------------- sony c-90 xdp-4000x soundstream van gogh 320.4 memphis mcsync5 ascendant audio 12" atlas kinetik 1400hc Posts: 378 | From: indiana | Registered: May 2005
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quote:Originally posted by amish power: AH is a form of capacity tells how much energy(current) a battery can store and can be measured many ways. capacity is one of the big 3 factors needed to figure out most any power application. take 2 batteries with the same ir but different capacity the larger capacity would be able to do more and last longer doing it without needing a recharge. in many cases the higher capacity battery battery will have a lower ir of its smaller counterpart. Try to pull too much current from too small of a battery and it wont do it reguardless of its IR as the current a battery can hold is not infinate
Correct, but a higher capacity could be the result of thick plates and you don't want that for SPL purpose. On the other hand, the DD and Batcap batts are only around 50Ah and they are one of the best SPL batts out there.
-------------------- Team DD Belgium - Dieter 2004: 153.2dB @ dB-Drag Street A certified 2005: 156,5dB @ dB-Drag Street A certified / 159.1dB @ IDBL Stock 1 worldrecord 2006:157.5 dB @ dB-Drag Street A certified 2007: 158.2 dB Worldrecord Street A / 158.3 dB @ dB-Drag Street A certified 2008: Benelux dB-drag judge Posts: 639 | From: Belgium | Registered: Sep 2003
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posted
Northstar, Powermaster XS Power, and Kinetik seem to be in a lot of winning vehicles.
Posts: 168 | From: RoadsOf, Florida | Registered: Oct 2006
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Unfortunately, everybody is all over the place with specifications. Amp hours really dont tell you much for SPL as it is a very low current 20hr test. CCA and CA dont help much either because they are 30 second tests at 0 and 32 degrees. Short Circuit tests are to 0 volts and measured in as little as 1 tenth of a second... not much help there either. For SPL, the number to have would be, how much current can the battery produce for 2 seconds at around 10v... unfortunately, there is no standard for this test, so you will never see it used by manufacturers.
[/QB]
Aren't those BCI CA and CCA tests where the battery is run down too 7.2v (12v battery) for 30 seconds? seems kind of worthless to audio considering amplifiers can't operate at that low of voltage. Heck almost seems worthless now in starting a car now that it doesnt take 10+ seconds and many cranks on the starter to start a modern day fuel injected car.
-------------------- sony c-90 xdp-4000x soundstream van gogh 320.4 memphis mcsync5 ascendant audio 12" atlas kinetik 1400hc Posts: 378 | From: indiana | Registered: May 2005
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posted
^^^^ must get paid pretty well up in Sask I see. being able to drop that kind of money on that many batteries
Posts: 819 | From: toronto canada | Registered: Sep 2002
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