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Old 10-22-2003, 12:27 PM   #1006
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Quote:
Originally posted by PitCrew
If you discharge down to .9 volts per cell at 30 amps, when there is no load, the voltage is going to jump right back up to 7.2+ for the pack. NiMH seem more suseptable to this than Nicd.
Yes that is exactly what they do. As soon as the discharge ends at 5.4 volts, if you leave it attached, you can watch the pack go RIGHT back to 7.x volts, like it was charging again.

So how do you incorporate all of this info?

30 amp discharge
the pack voltage going back up
using a simple blulb/resistor tray
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Old 10-22-2003, 12:35 PM   #1007
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Holycow! (cool handle)

Just unscrew the bulb when it goes out. After all 6 are all out or unscrewed, you have an equalized pack. If you check the cells, they will be real close to .9 volts each when the bulb goes out.

I have the same tray. "Indy Activator". You can also buy 1.5 amp bulbs from Integy or radio shack so it works faster and better. Just make sure you have 6 of the same bulbs.

David Root
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Old 10-22-2003, 12:45 PM   #1008
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Quote:
Originally posted by David Root
Holycow! (cool handle)

Just unscrew the bulb when it goes out. After all 6 are all out or unscrewed, you have an equalized pack. If you check the cells, they will be real close to .9 volts each when the bulb goes out.

I have the same tray. "Indy Activator". You can also buy 1.5 amp bulbs from Integy or radio shack so it works faster and better. Just make sure you have 6 of the same bulbs.

David Root
Exactly!

Dan
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Old 10-22-2003, 12:52 PM   #1009
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AHA! Uncrew the blulb! Now why is it that sometimes the easiest things are the last thing I think of? I will try that!

So are you saying that when the bulb is (just as an example) 75% out, that the cell is at .9 volts? Do you wait for the blub to be completely out?
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Old 10-22-2003, 12:52 PM   #1010
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Rory, No PM here. Can you send it again? Thanks.

Blue Sky: use a discharger to discharge it individually down to .9v per cell.

Berger: The packs when charged correctly should be around 145f~155F. Warm to slightly hot is a good thing for these cells.

Holycow: the reason behind using a good tray is that you want each cell to discharge evenly down to .90 cutoff per cell. This can be done with most tray that has a cut off of .90 which means the resistors will limit any current flow below .90v therefore the bulbs are not drawing any current at all. It also equalize the cells individually with this method and won't hurt the cells.

Dan
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Old 10-22-2003, 01:03 PM   #1011
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Dan - Got the batts built I'm ready for Sunday!
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Old 10-22-2003, 02:01 PM   #1012
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Quote:
Originally posted by holycow
But that doesn't do anybody any good if one cell discharges before another. If you pull when one bulb gets dimm, but another is fully bright, then you haven't used the tray like it was intended.

normally 1 or 2 or 3 bulbs go out before the others. My question is, is if one bulb is out, and one bulb is lit, is the cell with the "out" light getting drained below .9 volts?
I must not have stated that to clearly. I dont pull the whole pack off the tray when one goes dim, I just undo that cell from the resistor bank.

You can measure the voltage of the cell underload on the tray with a multimeter.
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Old 10-22-2003, 02:02 PM   #1013
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Quote:
Originally posted by Randman
Dan - Got the batts built I'm ready for Sunday!
Good luck at the races bro. Keep us posted how you did and how you like the cells.
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Old 10-22-2003, 02:04 PM   #1014
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Quote:
Originally posted by John Fontaine
You can measure the voltage of the cell underload on the tray with a multimeter.

I need a multimeter
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Old 10-22-2003, 02:07 PM   #1015
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Quote:
Originally posted by John Fontaine
Good luck at the races bro. Keep us posted how you did and how you like the cells.
Thanks John, I'll be in the Fukuyama booth on Sunday, hopefully I'll do good, gonna run pro stock.
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Old 10-22-2003, 02:08 PM   #1016
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Quote:
Originally posted by holycow
I need a multimeter
They're very cheap and can be found at any hardware store/sears and have a lot of applications in the R/C hobby. It's always in my toolbox when I race

Now you can really find out the voltage when those bulbs go dim.
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Old 10-22-2003, 02:15 PM   #1017
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Quote:
Originally posted by holycow
I need a multimeter
Flea market only a couple of bucks...
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Old 10-22-2003, 02:16 PM   #1018
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Quote:
Originally posted by Randman
Dan - Got the batts built I'm ready for Sunday!

Good luck Randy... Leave the Lowsie at home and kick some butt with the WEB...
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Old 10-22-2003, 02:26 PM   #1019
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I think he'll probably be running the Losi with all the work he put into the chassis. Besides, why run a coffee grinder when you've got a nice smooth Losi to run Right Randy?
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Old 10-22-2003, 02:50 PM   #1020
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Losi's a good car.
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