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Old 01-11-2005, 03:23 PM   #1
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Default Battery Volts

What are good readings for a 6 cell battery pack?

I have seen everything from 1.15 to 1.21 fo avg volts.. What are numbers to consider when purchasing cells?

Thanks,

Charley
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Old 01-11-2005, 03:26 PM   #2
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Depends on a few things, but firstly how good are you? If you are a rookie, just buy some cheap gp3300's as they will be fine for your first year.
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Old 01-11-2005, 03:30 PM   #3
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I'm a rookie but humor me if you don't mind. I will need to know this at some time.

Thanks a lot,

Charley
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Old 01-11-2005, 04:45 PM   #4
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You won't see 1.21 on a cell that has been discharged at 30A and averaged over the whole discharged time.

Basically, there are various ways matchers will cycle the cells, so make sure you are comparing like with like. Most discharge at 30A, others discharge at 20A or even 35A. Some will average the voltage over a period of the discharge, other will do it over the whole discharge. Look at the little numbers on the labels carefully.

As far as readings go, voltage and runtime should be high, internal resistance should be low. If it's a toss-up between voltage and runtime, higher volt cells make more sense for stock, higher runtime cells make more sense for mod.
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Old 01-11-2005, 05:22 PM   #5
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Great.. Thanks..

Charley
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Old 01-11-2005, 05:39 PM   #6
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Quote:
Originally posted by sosidge
You won't see 1.21 on a cell that has been discharged at 30A and averaged over the whole discharged time.
You and I won't see them.. but after walking through the pits at Novak race.. I guess Pros' get to see them. Saw some 450/1.20x wow
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Old 01-11-2005, 07:52 PM   #7
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What discharge rate is comparable to what our cars do? 30A?

Charley
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Old 01-11-2005, 08:05 PM   #8
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Our cars draw about 30A's on hot modifieds.
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Old 01-11-2005, 08:13 PM   #9
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Quote:
Originally posted by lee82gx
Our cars draw about 30A's on hot modifieds.
yup lee is correct but thats on average. if you hit the boards it can go up to 100A on the starting grid when you go full throttle on go ig goes up to 50A. when you are infield you rarely go full throttle so that means you seldome go over 30A inside.
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Old 01-11-2005, 08:24 PM   #10
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So if I am looking at different packs, I should make comparisons at 30A?

Thanks for the help,

Charley
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Old 01-11-2005, 09:46 PM   #11
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look at discharge rate (amps), cutoff volts (0.9V), and charging rates (amps)

IMHO its not quite advicable to compare numbers of matched batss made by diff matchers. due to the reason of having diff processes on matching, and preping the batts before matching process like zapping.
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Old 01-11-2005, 09:51 PM   #12
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Ok.. Thanks a lot..
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Old 01-11-2005, 09:54 PM   #13
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What avg volts would one consider a strong pack if discharged at 30A?
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Old 01-11-2005, 10:17 PM   #14
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its more of a case to case basis. cause what one person might find strong would be just average for one person.

my .02 are anything above 1.18 is considered to be a strong pack. you might want to keep an eye on the runtime cause its equally important especially for mod racing. again for me any pack that exceeds 420 secs. is acceptable.
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Old 01-11-2005, 10:32 PM   #15
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Ok.. Thanks again.. I appreciate the help..

Charley
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