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Old 03-14-2003, 04:33 PM   #16
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You really need to take a close look at the numbers in that picture.

Some matchers cycle at 5 amps while others cycle at 6 amps. The 6 amp charge will always yield higher average voltage.

So those 1.74 numbers would actually be in the 1.16 range at 5 amps.
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Old 03-14-2003, 05:18 PM   #17
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Quote:
...cycle at 5 amps while others cycle at 6 amps.
????
Now you lost me there...

6 is the charge current and is quite reasonable for 3300 GP cells. And if it's what the matcher sugests and your charger is able to do it there's no big deal about it. If the numbers are right you can charge at 6 amps to get them.

The manipulation generally happens in average voltage sampling time of other stuff. 360sec cutoff, or room temperature or whatever.

I never saw anyone doubting the numbers due to the charge current...
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Old 03-14-2003, 06:05 PM   #18
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there's this guy from Michigan named Chuck Lonnergan. He's been winning all kinds of stock races. Cleveland, Cincinnati Carpet Challenge, Carpet Nationals. At the Cinciinati Challenge he tq'd in both sedan and 12scale and took the win in both, Same happened at the Nationals. TQ and Sedan Masters winner at the Cincinnati Challenge was Junior Norton. You wanna know what batteries they ran 3300 SMC GP's. Say what you will about the numbers the performance on the track says it all. It doesn't help these guys are great drivers 'nuff said...
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Old 03-14-2003, 07:03 PM   #19
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Eh? I wasn't saying the number were fake. I'm just saying to take that into account when compairing batteries from another matcher.

For instance pro-match cycles their batteries at 5 amps. So ... their numbers will be lower than SMC batteries. If you were to charge the pro-match cells at 6amps you would get compairable numbers.
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Old 03-15-2003, 03:27 AM   #20
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well...not necessarily, charging at a higher amp rate might give you a more punchy battery on the track but the discharge average voltage would be very close to the same. Now if you said the discharge of 1.17 at 20 amps then I would definitely say those would probably be 1.15 at 30 amps but not really the case when charging at a difference of 1 amp current charge.
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Old 03-15-2003, 07:35 AM   #21
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Mal's right
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Old 03-15-2003, 08:12 AM   #22
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I'm interested in what different matchers say about charging and caring for their GPs. Pro-Match says to charge at 4-5 amps, use a storage charge of at least 10 minutes at 4 amps if not using the batts for a week or more, and not to use a tray to equalize the cells.
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Old 03-15-2003, 12:19 PM   #23
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What charge rate shud i charge my 3300 GP's at? Just got them today and am gonna run them for the first time on tuesday night. The have 431 sec run time, 1.169 av volts, 30 amp dis 2.8int resistance. Rick
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Old 03-15-2003, 12:26 PM   #24
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Charge them at 7amps with a .06 cutoff.
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Old 03-15-2003, 02:16 PM   #25
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Default wow...seems a bit high unless your willing to replace batts all the time.

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Old 03-15-2003, 03:56 PM   #26
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This is a direct quote from the smc-racing.com site:
"Most of our racers were using 6 to 7 amps with a .07 (70mv) peak detect for 6 cell packs and a .05 (50mv) with 4 cell packs. "

I've been charging my batteries like this for a long time and my packs are still just as strong as my new ones.
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Old 03-15-2003, 10:58 PM   #27
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i know in HK they are charging the latest GP's at 8a and have been doing so for some time with a small fall off in run time but no appreciable change in votlage...

its too hard to go comparing one set of numbers against another... there are too many variables... but you can get comparision numbers so an smc 1.174 is better than an smc 1.158 for example
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Old 03-19-2003, 06:04 PM   #28
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Mal: After reading your posts I decided to do a test. I took 4 random cells and cycled them at 5 amps.

6amps: cell 1: 1.173 - cell 2: 1.174 cell 3: 1.172 - cell 4: 1.178

5amps: cell 1: 1.169 - cell 2: 1.176 cell 3: 1.172 - cell 4: 1.177


As you can see the difference in charge rate doesen't seem to alter the numbers.

We use a 6amp charge rate because this is what we use at the race track.
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Old 03-20-2003, 01:19 AM   #29
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I've seen some Orion GP3300 rated at 1.177, 30amp, and 420 plus runtime. I believe that these are the team packs. So far, this is the highest i've seen at my LHS.
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Old 03-20-2003, 09:36 AM   #30
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Insteresting numbers Danny.

I'll have to rethink what I know about batteries. Thought charge rate would have an effect on voltage.

Thanks testing it out for us.
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