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Old 11-20-2006, 09:46 AM   #16
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The question are :
1. Is it normal to have such matched batteries with that initial voltage like that ?
Yes, it is normal for all the batteries like GP, Team East or IB cells. After storage for some time without using it. The voltage keep droping while the capacity of the charge going down. For your new matched battery pack, most likely is the dealer had been kept this pack for for sometime until it is in your hand.


2. Is it possible if the fresh battery have bigger voltage ?
I assume you mean higher voltage=better voltage. No, it is not related. High or low voltage can be new or old cell.

3. Will they be deteriorate if we not use them for long time (bought from the LHS and not assemble them for quite some time -> 2-3 mths) ? i.e. voltage drop.
It is good to have some charge before storage your battery. Acccording for your case, a 0.9Volt battery still not yet deterioration.

4. Any side effect of charging this kind of cell (with initial voltage below 1 volt) i.e. less runtime, bigger IR or low punch ?
No, it should have no side effect unless your battery is initially bad.


5. And any side effect for cell with high initial volt (1.216v in this case) ?
Will it be too hot so the ESC / motor can't stand the heat ?
A 1.2x voltage is normal cell, this is normal voltage. That's why is is no side effect. After you charge your 0.9 volt battery and discharge. You will see your battery back to normal at 1.2x volt.



6. How long does this 4200 mah MATCHED cells usually loose its performance (degradation)with such initial voltage like above (0.916V before assemble and charging), assuming I use them for racing twice a month and follow your battere maintenance tips.. ?
0.9v battery degradation issue answered previously.
You try it and you can tell us. The IB cell is great for racing but not durable as GP. GP is more durable on keeping the perofrmace longer. You see all top racers is using IB cells because they get sponsorship. They don't look for durable. They only look for which is faster.
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Old 11-20-2006, 10:14 AM   #17
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akuhon: Can you tell me if the SMC 4200 pack is the normal 4200 , SHV or WC ? One of the problems is that NiMh cells self discharge over time. Once our matching process is done we put a certain amount of charge back in the cells to hel the cells from self discharging to low.

If the cells go below 1 volt or so this will affect the cells capacity. The voltage and IR should still be good but the capacity of the cell will be reduced.

Prior to the first charge I would charge up the pack for 600 seconds and then discharge it. Let it cool down for an hour then you can do a complete charge on it.


As far as performance with higher voltage cells you need to find the proper motor setup to not get the motor to run to hot. Once this is done your lap times will be faster with the newer high voltage cells.


We reccomend keeping 500 seconds of charge in your packs using a 6 amp charge. If you do this your packs will be o.k. to be stored for 2-3 weeks with no issues.
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Old 11-20-2006, 10:16 AM   #18
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Quote:
Originally Posted by akuhon
Don't assemble yet .....
The EP 4200 is UV edition ....

I think they're in par with IB4200WC.

Based on what we have tested and what most racers and matchers use the IB4200WC is the most powerful cell.
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Old 11-20-2006, 10:20 AM   #19
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ioxqq: The GP3700 and GP4300 actually have the same charecteristics as the IB cells as they have tried to increase the voltage by dropping the IR. So you get cells that react similarly to IB but have lower performance.
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Old 11-20-2006, 08:28 PM   #20
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ioxqq and Danny/SMC :
Thanks for the information. I'll keep this info for my reference.

Danny/SMC : I think it's the 1st version of your IB4200 matched products 'cause... I see no SHV nor WC mark on it .... But I'll let you know later in detail ....

Thanks all ....
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Old 11-21-2006, 08:35 AM   #21
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FWIW-its customary to put 500 seconds back in a pack of 4200's (any of them-WC, SHV, original).

But I would put in more like 1000 seconds or 1500mAh if your not going to race them for a few weeks!! They self discharge so fast as a side effect of the ultra low internal resistance. I put at least 500 seconds in mine after the HC and pulled them out to run exactly 3-weeks later and they were all almost fully discharged already.

Luckily they were fine. I cycled one for S&G's and it was a paltry 435 seconds at 4.93 voltage at 35 amps And that pack was run first at Vegas.

Ray
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Old 11-21-2006, 01:37 PM   #22
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Hi Ray,
When you say almost all discharged what was the resting voltage at ? It seems like the cells can handle going down to 1.05 volts or so with no problems. It's when they fall underneath 1 volt that you should see a drop in runtime.
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Old 11-21-2006, 01:52 PM   #23
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So are you saying that we should reset our DPDs and Smart Trays to 1.05v or is that just a resting voltage minimum ?
Thanks for the info.
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Old 11-21-2006, 01:55 PM   #24
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That is resting voltage. So if you leave a pack sitting around for awhile if the voltage stays above 1.05 the pack should still be fine.

For discharging .90 is still the right cutoff.
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Old 11-21-2006, 08:32 PM   #25
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Quote:
Originally Posted by Danny/SMC
That is resting voltage. So if you leave a pack sitting around for awhile if the voltage stays above 1.05 the pack should still be fine.

For discharging .90 is still the right cutoff.
How about full-charging for a month storage (not using it) ?
Does it give negative effect ?

Then when we want to use, dicharging 0.9v cut-off, equalize and charging ?
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Old 11-21-2006, 08:41 PM   #26
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For 1 month storage I would put 1000 seconds back in your pack for storage. We have never tried keeping a full charge but I don't think it would be better than 1000 seconds.
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Old 11-21-2006, 08:46 PM   #27
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Quote:
Originally Posted by Danny/SMC
That is resting voltage. So if you leave a pack sitting around for awhile if the voltage stays above 1.05 the pack should still be fine.

For discharging .90 is still the right cutoff.

Would like to know, before charging the cell . Should I discharge using 0.90 cut-off , before charging, or should a lower cut off be used? I using a smart tray by the way...
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Old 11-21-2006, 08:46 PM   #28
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Quote:
Originally Posted by Danny/SMC
That is resting voltage. So if you leave a pack sitting around for awhile if the voltage stays above 1.05 the pack should still be fine.

For discharging .90 is still the right cutoff.
Hi Danny,

Would like to know, before charging the cell . Should I discharge using 0.90 cut-off , before charging, or should a lower cut off be used? I using a smart tray by the way...
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Old 11-21-2006, 08:46 PM   #29
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Hello,
I just got some 4200 cells and was wondering when I assemble them should I charge them at 5 or 6amps? I race once a week and didn't know if I should charge them at 5 or 6. I have heard that if I charge at 5 amps that the battery will last longer? Also should I disharge them before I charge them? I am using an indi zero 6s.Thanks,
Justin
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Old 11-21-2006, 08:49 PM   #30
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You should use .90 for cutoff prior to charging.

As far as charge rate we use 6 amps which isn't harder on the cells.
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