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Old 12-02-2004, 09:33 PM   #6076
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The whole pack could be damaged. I'd get a hold of Dan and get that pack in to be tested. Neither one of you has a GFX do you?
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Old 12-02-2004, 10:19 PM   #6077
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Default Need help, I'm still learning.

I just got a Indi Zero Thirty -030 discarge tray. It has a cut off at 0.0v cell. Does this have a dead shorting affect? Fukuyama recommends discharging them down to 5.40 for a six cell pack. Should I return this discharge tray for one that I can adjust like the Novak one?
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Old 12-02-2004, 10:45 PM   #6078
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Get the Rayspeed discharge tray, it's really nice and adjustable
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Old 12-02-2004, 10:50 PM   #6079
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I have a novak and it has been treating my fukuyamas great! You should never bring a pack down below 0.9 volts per cell. Unless you intend on deadshorting of course. Get the novak....you will not be dissappointed.
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Old 12-02-2004, 11:13 PM   #6080
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Either the Novak or the Yokomo will work just fine. The Novak is more $$$ but looks cool and the Rayspeed works very well and is less expensive. The Novak does have an adjustable cut off but we reccomend you leave it at .9 per cell anyways so that really dosen't matter.
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Old 12-02-2004, 11:20 PM   #6081
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You HAVE to plug the Novak tray into a powersupply for it to work, as long as you're doing 6 cells and the .9 cutoff, the RS tray doesn't need to be plugged into anything.
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Old 12-02-2004, 11:28 PM   #6082
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True I only did that once though when I had to but I didn't realize the pack was over half full still and the tray got really hot without the fan running.
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Old 12-03-2004, 12:20 AM   #6083
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Default Man that sucks!

I really liked the Integy Indi Zero Thirty 030s design. I liked that it's bi-polar and how it holds the battery. Why didn't they just make it with adjustable cut off? I'll have to take it back now.
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Old 12-03-2004, 05:45 PM   #6084
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Some people do still take their cells down to 0.0v and dead short. It's not something we recommend doing though. Those are the people that tray is aimed at.
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Old 12-03-2004, 05:52 PM   #6085
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Default Is there a difference between taking them...

to 0.0v and dead shorting them? Dead shorting them is that somthing else? Sorry, still learning.
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Old 12-03-2004, 06:08 PM   #6086
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Don't be sorry, this is how you learn things like this.

Dead shorting is keeping them at 0 during storage by shorting the pack. Once you take a pack off a discharger, the voltage will bounce back up. People who dead short will solder a length of wire from the positive lead to the neg lead to keep it at 0.0v. The idea is that it's supposed to increase the voltage. While this is possible it's a very minimal increase and can be dangerous. It can damage the pack and you if you're not careful. It WILL shorten your runtime considerably as well. Again, we DO NOT recommend dead shorting your packs.
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Old 12-03-2004, 07:25 PM   #6087
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Why risk it when there are many more ways to be fast?
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Old 12-03-2004, 11:49 PM   #6088
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Default Humm....

I think I understand now, so any discharge tray that takes them down to 0.0 cut off per cell actually dead shorts them?

So is there a difference in keeping them at a cut off per cell between storage and/or just before you would want to charge them? If I understand this, it best to have them at 0.0 cutoff just before you charge the pack and/or leave them at .90 if you store them in between racing? Do you want them at .90 cutoff per cell for storage or all the time? Sorry, I just want to understand this.

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Old 12-03-2004, 11:56 PM   #6089
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It dead shorts them while they are in the tray. But you don't store your cells in the tray. As soon as the load that's placed on the cells during a discharge is removed, they will bounce back up in voltage. True dead shorting is taking them down to zero and then shorting them with a length of wire for storage so they stay at 0v.
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Old 12-04-2004, 12:14 AM   #6090
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You don't want to take them to 0.0 ever. Here's the procedure we recommend.

Discharge the pack to 5.4 volts. (.9v per cell) and store it. You'll notice on the display if you're using a discharger like the one on a GFX or any charger with a display and a discharger, (which I recommend looking into as an investment if you don't already have one) as soon as the discharger hits 5.4 volts it will stop and the voltage on the pack will bounce up to about 7.2. This is what's called voltage bounce. It's normal. Store your cells in this state making sure they're cool before you put them in any enclosed case. When you get to the track and you're getting ready to charge the pack, put them in a tray with a .9v cut off per cell. The difference here is that you're using an equalizing tray to drop each cell to .9v. When you discharge the pack on your regular discharger to 5.4, you could have one cell at 1.1 and one at .7. They're not equalized. So put the pack in the tray to equalize the cells to .9v per cell. Once they're equalized, take it out and hook it up and charge it. After you've run the pack, hook it up to the discharger to discharge the PACK to 5.4v again, let cool and store. Discharging the pack should be done with a discharger that can do 20-30 amp discharge rates and has a cut off of 5.4v across the pack. This is how the cells are matched and trained and it's best to continue with that. I don't like to run my packs twice in a day but I don't need to either. I realize a lot of people do need to though. If you do need to, make sure they have enough time to get completely cool before charging them. And never force cool your cells with a fan. It can cause an imbalance inside the cell and shorten the life of the cells. 2-3 hours is a good rule of thumb for cool down time between charges. Hope that clears it all up for you.

Damn, did I just write all that?!
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