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Old 03-30-2005, 05:04 AM   #16
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Well done Bob - great to share this kind of info around. I found a small error though - the runtime and voltage numbers were the wrong way around (probably a typo more than anything). The IBs are the 374s at 35amps and GPs are 416s at 30amps.
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Old 03-30-2005, 06:41 AM   #17
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Default We need more of this

We need more of this kind of objective scientific testing of RC products is what .

The only thing which would help this kind of battery testing is if we could do a better simulation of actual amp draw than just a constant 30 amp drain.
I see no obvious reason that this would change which battery tested better, but it could minimize or eliminate the gap.

You could possibly add this step.
Discharge for 1 minute. Put the battery in a car. Measure the time it takes the car to go 100 feet from a standing start with a stop watch.
Repeat the test at the 2,3,4,5 minute points.

Without this additional protocol aren't you assuming "punch" is
identical with measured voltage at a given time in the discharge cycle.

I could imagine a battery or battery technology which maintained a good averge voltage but when called on for maximum amperage was either slow to deliver or delvered less.
Not to overcomplicate things but if you wanted a more definative answer you could repeat the above tests switching out a stock motor for a mod motor.
and using a 30 amp drain is arbitrary. I would think you could do several 5 minute race simulations and then measure the actual voltage at the end of the race, if you were to compare this number to discharge curves for 20,25,30,35,40 amps you could determine which discharge rate most closely emulates real life conditions(again you would need to do this with bot hstock and Mod motors)
Th only reason I suggest thes extra steps is that when you choose to test something artifically(indirectly) and you get very close results you can not always draw statistically meaningful conclusions from the data.

Last edited by imjonah; 03-30-2005 at 06:52 AM.
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Old 03-30-2005, 08:19 AM   #18
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That is an awesome job you did on your analysis. I have the same charger too. It will be great for us average racers to get some data that we can actually use. Most other comparisons i have seen are on some crazy $90 per pack that the average joe racer would not be able to afford.
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Old 03-30-2005, 09:02 AM   #19
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Quote:
Originally posted by veecee
I found a small error though - the runtime and voltage numbers were the wrong way around (probably a typo more than anything). The IBs are the 374s at 35amps and GPs are 416s at 30amps.
You're right, veecee... it was a cut-and-paste mistake. It's been corrected, thanks!
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Old 03-30-2005, 09:10 AM   #20
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Default Re: We need more of this

Quote:
Originally posted by imjonah
We need more of this kind of objective scientific testing of RC products is what .

The only thing which would help this kind of battery testing...
I agree, imjohnah... I think there are a number of ways to improve the discharge evaluation. I think I read that Orion does a "race simulation" when discharging in their matching process... changing the load on the cells as it would in a race. That would certainly do a better job of determining how each cell holds up under changing demands.
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Old 03-30-2005, 09:40 AM   #21
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I have noticed when someone makes a decsent comparison with some merrit there is always someone bitchin about the way the test was done. Jeeze guys take it as informative. the guy spent his money and did this on his own stop looking for the negative shit in someones effort to offer some insight on the equipment we use without spending money off our own.

Bob your test was very useful and the fact that its unbiased because your not selling or making money off of us is appreciated and will help us decide which type of battery some of us will want to buy.
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Old 03-30-2005, 09:50 AM   #22
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From the graph it appears as if the IBs are more consistent in terms of runtime than the GPs. The Gps looked as if they lost of runtime after each cycle.
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Old 03-30-2005, 09:50 AM   #23
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I would like to see more unbiased testing like this...similar to what Tomshardware.com does for computer hardware. Real, proven testing methodology, conclusions based on test results, not echoes of manufacturer propaganda.

You go, Bob!
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Old 03-30-2005, 10:05 AM   #24
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Attempting to perform an actual scientific test for PUNCH won't even work correctly to provide the user with any type of data that would be rellevant to his/her application...

The issue is there are WAY too many variables you are attempting to control....car, driver, temp, tires, gearing, etc....so what makes the battery punchy in my test car, may make it a slug in yours....

The test done here, was excellant...limited variables with straight test numbers.....and then an opinionated run of the car on the track.

Good job...

And I can tell you why the price went down to $45...cause the Ib3600 is already being replaced by the new IB3800...

Later EddieO
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Old 03-30-2005, 11:07 AM   #25
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Quote:
Originally posted by EddieO

And I can tell you why the price went down to $45...cause the Ib3600 is already being replaced by the new IB3800...

Later EddieO

Is that right? I was worried that the price drop was just a way to clean house.
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Old 03-30-2005, 10:37 PM   #26
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nice work bob!
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Old 03-31-2005, 12:30 AM   #27
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Thanks!
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Old 03-31-2005, 08:17 AM   #28
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nice work bob!
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Old 04-01-2005, 05:56 AM   #29
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Useful info - thanks.

Found this on a Swiss website - another test:

http://www.rcworld.ch/neueprojekte.asp?id=1697#eng
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Old 04-01-2005, 06:01 AM   #30
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We have had track time with the IB3800 , these are wicked awesome.

Charges over 4200mah on our GFX!!
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