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Old 02-15-2005, 12:47 PM   #3436
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Right, i used to think that the higher the capacity the lower the voltage would normally be on average.

Is this correct or does a cell have more voltage like the new 3700s have more voltage than 3300s?
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Old 02-15-2005, 12:51 PM   #3437
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the 3300 3600 3700 is milliamp hours. which basically tell you that the battery has 3300 miliamps of discharge in one hour. or 3600 or 3700 or 3800
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Old 02-15-2005, 12:54 PM   #3438
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yes so, you can acheive the same voltage from any capacity cell?
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Old 02-15-2005, 12:58 PM   #3439
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theory is yes, but voltage is just a product of current and resistance. so it is dependent on the ir of the cell.
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Old 02-15-2005, 01:00 PM   #3440
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Ok,

So its false if somebody said "3700s have a higher voltage than 3300s"?

Thanks for the help.
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Old 02-15-2005, 01:05 PM   #3441
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as a generic saying, yes. but the characteristics of the cells could offer a higher discharge voltage then say the gp3300
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Old 02-15-2005, 01:07 PM   #3442
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Oh right.

but if they were all discharged at the same rate, in theory they should be the same?

Thanks again.
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Old 02-15-2005, 01:10 PM   #3443
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no. The internal characteristics of the cell, the spec that they are made and the characteristics of the materials may yield a higher discharge rate.
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Old 02-15-2005, 01:15 PM   #3444
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ok thankyou

but if we lived in a perfect world, and they made the gp3300 the same as the gp 3700 they would be the same voltage...?

Sorry to keep pestering
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Old 02-15-2005, 01:16 PM   #3445
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true if all things are equal. BUT how can they be equal? one is 3300 and the other is 3700? unless they just changed the label on the cells.
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Old 02-15-2005, 01:25 PM   #3446
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ok, so 3700s have a higher voltage?

are you saying a 3700 could be higher OR lower than a 3300? depending on the characteristics like ir etc?
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Old 02-15-2005, 01:35 PM   #3447
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bascially,

If GP made the cells the same exact way with the same materials and specs, then the 3700 will have 500mA more in capacity, but no more voltage. Now to have a longer discharge or more capactiy, with all things being equal, will yield more consistent voltage along the discharge curve.If the cells have lower IR, then they will yield higher voltage. If the cells yeild more capacity, then the discharge curve will be extended and there for will yield a higher average voltage along a longer discharge curve.

So basically I would think that it is still too early to tell if the cell will yield higher voltage over all. But to say a 3700 has higher voltage then a 3300, I think that is too early to say. Unless Gary and some other matchers know things that they are not sharing with the world at this point. lol

Until more matchers are matching the cell and people are breaking the cells down. we will not be able to say that the 3700 have more voltage then a 3300.


remeber the spec of a battery like a gp3300 is that if you were to discharge the cell at 3700mA for 1 hour, the cell will yield 1.2volt plus or minus. so for 3700s you would be able to discharge at 3700mA for 1 hour and get 1.2volts plus or minus
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Old 02-15-2005, 02:03 PM   #3448
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Thankyou very much

I now understand what you mean properly.
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Old 02-16-2005, 07:30 AM   #3449
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I am quite positive in saying GP3700mAh cell will not produce any higher voltage then the 3300 cell -- If they end up producing the same amount we'll be lucky. You have to remember that they're trying to squeeze a higher capacity in the same size can - I've been told by the engineers that is pretty hard to do. Typically there is some sort of compromise, perhaps voltage, perhaps runtime.

From cell samples of GP3700's, it looks like we might get lucky...

Oh and FYI all, the X-ray ceramic bearing kits are in flight and should be here shortly.
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Old 02-16-2005, 02:00 PM   #3450
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gary got any ceramic bearings for the tamiya 415, oh and i got my batts and motors today assembling it tonight and try out this weekend. excited
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