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Old 09-28-2005, 03:47 AM   #181
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Originally Posted by Danny/SMC
I would assemble them then charge and discharge the packs. Once it's cool put 500 seconds of charge back into the pack. In 6 weeks discharge the pack down to .90 per cell then charge it up and discharge it. Once it cooled down put 500 seconds of charge back into it and it will be o.k. like this for another 6 weeks.

These are just precautions that you can take to make sure they hold up. They could be left alone and hold up but they are just to knew for us to know the maximum shelf life. It's better to be safe.

im just curious, wouldn't it be better to fully charge the pack if i were to store it for a long time, then just cycle it before i was goin to use them again? thanks
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Old 09-28-2005, 03:51 AM   #182
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If you wait too long, it dosnīt matter as there is probably new better one out there anyway...
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Old 09-28-2005, 07:15 AM   #183
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Quote:
Originally Posted by highwayman
im just curious, wouldn't it be better to fully charge the pack if i were to store it for a long time, then just cycle it before i was goin to use them again? thanks
I'm no battery expert but I do know if the head honcho of a good battery company gave me some advice on a question that I asked......I'd use it.
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Old 09-28-2005, 07:45 AM   #184
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Originally Posted by STLNLST
head honcho of a good battery company
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Old 09-28-2005, 12:09 PM   #185
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Quote:
Originally Posted by highwayman
im just curious, wouldn't it be better to fully charge the pack if i were to store it for a long time, then just cycle it before i was goin to use them again? thanks
It's impossible for me to try every single way to store and maintain cells. What we have tested so far seems to work well and is best used as a precaution. I think that IB cells can go a few months without any issues but it's better to be safe. I think putting to much charge back into the pack is not good it may increase the cells IR. If you do put 500 seconds back into a pack and don't touch it for a longe period of time it will still drop off. This is why I mentioned to charge and discahrge it after 6 weeks to make sure it stays in good shape.

When NiMh cells came out I put charge back in 4 loose cells and let 4 loose cells with no charge in them. Six months later I put them back on the matchers and they all cells had dropped off.
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Old 09-28-2005, 12:12 PM   #186
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Quote:
Originally Posted by dmayhew25
I just got the chance to run both the IB3800 and the GP3700 and could tell a difference in power for sure! The IB was a lot more punchy. I have some really good 3700's that are now good for nothing more than club racing. I will never buy another GP after running both. Oh, and both were run in stock and 19t, both also had #'s over 1.19. Just what I experienced.


I think after the Vegas race many have seen the potential of the IB3800. The key to this cell is to detune your motor a bit to get to use the extra voltage and power of this cell.
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Old 09-28-2005, 12:15 PM   #187
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Quote:
Originally Posted by Danny/SMC
I think after the Vegas race many have seen the potential of the IB3800. The key to this cell is to detune your motor a bit to get to use the extra voltage and power of this cell.
Even in stock/19t.
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Old 09-28-2005, 12:19 PM   #188
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Quote:
Originally Posted by Ramyuras
Even in stock/19t.
Cant vouch for stock/19T on road but I know in oval
Steve Salvas did some tests in Oval and he said reducing the amp draw of the motor helped out.

Here are his findings:

Here's some more info ... With these IB3800 cells my best runs in 4-cell stock so far, has been with lower amp draw motors ... "same GP3300 rollout" with .5A-.8A less amp draw at 2.5V with a fan. It might not have been noticeable at first ... but these cells with higher voltage output tend to heat up the motor more ... if you hear a fellow racer say: These IB3800 cells suck ... "they rocked for the first 2 minute then they went flat" ... run to the car with your temp gun and politely offer your help ...

Here's what I experienced this past weekend ...

Track: Glens Falls NY
1st qualifier (5 minutes)...
Monster type (handout, purple endbell)
Motor draw: 8.5A @ 2.5V
Rollout: 1.85
Run: 83 laps 5:01
Motor temp (rotor): 165F
Comment: Went flat at 2 minute mark, motor smells like shit!

2nd qualifier (5 minutes)...
Epic Stock (2 magnet)
Motor draw: 8.4A @ 2.5V
Rollout: 1.78
Run: 83 laps 5:02
Motor temp (rotor): 140F
Comment: Rollout too short, didn't rock up front

3rd qualifier (5 minutes)...
Monster type (same as 1st qualifier)
Motor draw: 7.6A @ 2.5V (took .010 off leading edge)
Rollout: 1.78
Run: 84 laps 5:02
Motor temp (rotor): 129F
Comment: Rollout too short, didn't rock up front (still) ... motor -36F

A-Main (5 minutes)...
Monster type (same as 1st and 3rd qualifier)
Motor draw: 7.6A @ 2.5V
Rollout: 1.85
Run: 85 laps 5:02
Motor temp (rotor): 132F
Comment: WOW ... motor rocked ALL 5 minutes!!!

Steve.
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Old 09-28-2005, 12:28 PM   #189
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Everyone is use to the GP3300 which is/was a great cell. The GP3700 is basically a 3300 with 20 extra seconds of runtime. The IB cells are constructed differently and use different materials which means they react differently. The IB cells have the highest average voltage and seem to be able to deliver more power. The extra voltage/power requires the motors to be detuned or else they run to hot and you go flat. Many think that going flat is a result of the pack but in fact it's the motor getting to hot.

I think that the racers and motor tuners are going to find the proper motor setup as they get more track time with the cells.
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Old 09-28-2005, 01:19 PM   #190
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This really makes sense from what I experienced with my 19t last month. With new 767 brushes and no filing/drilling, the motor ran hot and went flat after a few mins. Then after I replaced the brushes with 767's drilled 1.5mm, the motor ran fine and had power throughout the run. I've always drilled my stock motor brushes and they've been running great with the IB's.
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Old 09-28-2005, 03:46 PM   #191
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are either of these batts legal for roar yet? just curious, thanks
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Old 09-28-2005, 04:03 PM   #192
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ROAR only allows new cells to be approved January 1st. Both cells should become legal because they are within the specs.
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Old 09-28-2005, 07:23 PM   #193
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I have been running the IB's for the last few months from my local Matcher Feral Racing, and have been extremely happy. Danny is right it does require a bit of a different motors setup to get the most from the cells, also of Note is that a coupel of racers around here have had issues with some speed controls, especially the Q2, on the track the car felt dumped to them, but the motor is still in good nick and tons of runtime left in the pack after thr run. They have changed to GTX's and car is a missile for the whole run.

Just food for thought.
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Old 09-28-2005, 07:46 PM   #194
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Does the Q2 have some sort of circuitry that causes that? I didn't know that could happen. And why doesn't that happen with other cells?
-Josh
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Old 09-28-2005, 08:37 PM   #195
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Very good info thanks guys.
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