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Old 06-04-2006, 10:01 PM   #1
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Lipoly troubles.

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Well, it's done with now, but I'll post anyways.

A buddy had a cell get cut somehow in the air. The battery is a Tp 2100 3C. Battery started to smoke, and he brought the plane in OK. Removed battery and left it at the field. It's been there for over a week.

Today, I went out for some stress releif in the rain, and noticed the battery still there. I put my meter on it, and it still read 7.5 Volts. Obviously not discharging at all. I decided to accelerate the process.

Can of salt water in hand, I place the battery inside. Meter was left on to see what would happen, and it didn't do nothing.

So Me, in my infinite wisdom, remembered somewhere to puncture the battery.

This worked splendidly DON"T DO THIS!!!

Battery boiled the water, emitting the worst smelling smoke I've ever smelt. Voltage went to 3.8 volts almost instantly. I guess I only punctured one cell. Same thing went again. I'm a sucker for risk I guess. DON"T DO THIS EITHER!!!!

Now I have a completely safe and dead battery. And my house stinks. Just the 1 open window and the door being open when the wife was screaming at me was enough to stink up the house.

I hope the neighbours didn't see me, or I'm in for some trouble I think.

Next time, I'll need to discharge the battery, but is it OK to put a 3 c lipo on a discharger, even if 1 cell is dead?

Thanks in advance, and don't try this at home. I'm in trouble so you don't have to be!!
Michael Gyger
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Old 06-04-2006, 11:21 PM   #2
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In the house???????????????????? :
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Old 06-04-2006, 11:32 PM   #3
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All done outside, but near the house.(50 feet away) Biggest cloud of smoke I've seen.

I posted this as I know everyone is worried about these things. The guy's I fly with were split on how to get rid of this. I picked the wrong way.

The proper way is to slowly discharge the battery, in a safe place. (I'd do it in a pot of salt water, and discharge it in there). Once the battery is down to 3 volts per cell (per good cell I guess, so i should have gone down to 6 volts total, as one of the cells was damagaed already) then puncture it. Not until.

Please correct me if I'm wrong.
Michael Gyger
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Old 06-05-2006, 06:18 AM   #4
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This whole "put it in salt water" thing is silly. Whether it is done it as sometimes advised in "instructions" found on the internet or "improperly" as described here, it doesn't work.

Just do what the manufacturer's recommend. Discharge slowly down below 3v/cell and throw them away.


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Old 06-05-2006, 08:47 AM   #5
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You should have pounded it with a hammer
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Old 06-05-2006, 10:08 AM   #6
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I was wondering what that putrid cloud was out by Chilliwack.....hey Mike, watch out, I saw the Haz-Mat Emergency Response Team heading your way!!!! :P
Ron Mattiuz

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Old 06-14-2006, 09:29 AM   #7
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Left it at the field??? Wasn't that just a tad irresponsible? What if somebody's kid had found it ?
Of all the things I've lost, I miss my mind the most...
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