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HelicopterMain Discussion › DURALITE - how can it be discharged?
04-26-2004 01:52 PM  13 years agoPost 21
MJWS

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Airdrie, AB - Canada

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I don't have those cells, just quoting the specs for you from duralite. They probably see 4+ amp spikes in your heli. Just keep an eye on the temp and see how they respond. They can feel quite hot to the touch and still be well within tolerances. Sorry I don't know the exact max temp, but 1C (4A) draw out of a battery isn't typically very high.

I've always thought Duralite was very conservative in its ratings. What kind of connectors do they have? You may be reaching the tolerances of the wiring at 4 or more amps.

Just watch the temps and slowly increase the draw until you are comfortable.

Mike

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04-26-2004 05:30 PM  13 years agoPost 22
w.pasman

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Netherlands

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Be carful if you discharge with a resistor, the dropoff in voltage when the pack is empty comes suddenly and is steep, expecially with higher discharge rates.

But I would not discharge a bad pack, the cells won't be balanced and you risk driving part of the cells below their minimum voltage and maybe even negative. That might cause danger.

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04-27-2004 06:39 PM  13 years agoPost 23
I3DM

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Israel

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w.pasman - i thought about it and to me it seems that if you have 1 bad cell, its voltage is lower and thus the pack will actually reach its discharge point (5.5V in this case) FASTER then a regular pack would, because the faulty cell is actually dropping the voltage down, no ??

www.liorzahavi.com

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04-28-2004 11:33 AM  13 years agoPost 24
w.pasman

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Netherlands

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I3DM

Yes the voltage is supposed to drop quick or it would not be a bad cell

But it could be that bad that it is 0V straight from the start. Or that it blocks any current through it, causing the entire pack to go to 0V if you have a few cells in series. Or that it shorts out the other cells in parallel, causing the other cells to break down as well.

In short, if the pack is still under warranty I would not waste time on trying to figure out what happened and return it to the factory without further fiddling. Trying to discharge may cause further damage, and maybe not only to the pack.

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HelicopterMain Discussion › DURALITE - how can it be discharged?
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