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holes in LiPo after crash

Old 09-16-2006, 11:34 AM
  #1  
diego007
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Default holes in LiPo after crash

Does anyone know how to repair this LiPo. The charge and the Voltage are still OK.
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Old 09-16-2006, 01:19 PM
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XE521
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Default RE: holes in LiPo after crash

Hi,

if the case has been perforated DO NOT REUSE OR RECHARGE!!!!!.

Do not discard in a charged condition. Place batteries in a bucket of salt water for a couple of hours, then dispose of in the rubbish. They contain no poisons and are of no danger to the environment.

Should you retain, repair or reuse the batteries BE PRPAIRED FOR A FIRE.

How much is your model worth compared to a set of new batteries? Read the manufacure's warnings.

BE CAREFUL.

Regards.

Karl.
Old 09-16-2006, 06:00 PM
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Cyrus Abdollahi
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Default RE: holes in LiPo after crash

Throw it in the dumpster, it's worthless.
Old 09-17-2006, 04:56 AM
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diego007
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Default RE: holes in LiPo after crash

Ok, I think what you guys say it's to dangerous to reuse them. I don't wont a fire in my plane
Old 09-17-2006, 05:21 AM
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Default RE: holes in LiPo after crash

These arn't my pictures, but just to show people what a blown lipo can do... [X(]
http://www.robowars.org/forum/viewtopic.php?t=849
Old 09-17-2006, 07:17 AM
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Default RE: holes in LiPo after crash

Hi dyrodium,

keep us posted on that one.

Up till now I've only seen one fire, caused through incorrect chaging. But the guy was lucky, it was in the field and he'd had the sense to remove the pack from his model.

Makes one wonder just how unsafe the lipos are. With the reports of callbacks by Dell & Apple as well as the recommendations of not charging in the house (unless attended), charging on fireproof surfaces, storing packs in fireproof containers.

I have several pieces of equipment here at home, e.g. mp3 player, with built in lipos. Do I have to place them in a bucket every time I want to charge them? [sm=spinnyeyes.gif][sm=spinnyeyes.gif][sm=spinnyeyes.gif]

Regards.

Karl.
Old 09-17-2006, 09:42 AM
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diego007
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Default RE: holes in LiPo after crash

that was my thought either 'xe521'. I thought they only could caught fire when there overcharged or undercharged.
Old 09-17-2006, 10:23 AM
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Cyrus Abdollahi
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Default RE: holes in LiPo after crash

I always treat them as if they can catch fire under any circumstances.
Old 09-17-2006, 11:23 AM
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Default RE: holes in LiPo after crash

Dunno about a fire hazard through over discharge but it certainly gives them a wobbler.

Reports quoted that several Dell computers (I think laptops) burst into flames and they had to recall a fantastic number of machines. What the problem was with Apple I don't know, they never expanded on that subject except to say it also affected a large number of units. Maybe I'll have a look in the IN.

But to store unused packs in fireproof containers [sm=confused.gif][sm=confused.gif]

Cheers.
Old 09-17-2006, 12:46 PM
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diego007
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Default RE: holes in LiPo after crash

I gonna store mine in a fireproof container after seeing those pics of burnout planes and worktables
Old 09-22-2006, 07:27 AM
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diego007
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Default RE: holes in LiPo after crash

I have soldered the pierced cell out and neutralized it with salt water. The cell went way behind the 2.5V and never caught fire ore something. I think this things are relatively save
Old 09-23-2006, 01:45 AM
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dyrodium
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Default RE: holes in LiPo after crash

I wouldn't call them safe... I'd call them unpredictable. Due to the huge amount of people who use them they are obviously safe for most normal use, but there is truth behind their many warnings, as seen in those pics and various video tests on the internet. As well as reports of them blowing for various reasons. Personaly I still don't use them, I much prefer NIMH and NICAD It's still a really young battery technology... I will be interested to see where it is at in five years time.
Old 09-24-2006, 01:31 PM
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gleebs
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Default RE: holes in LiPo after crash

It is just not worth using even if you removed the bad cell. Maybe nothing will happen. I took a fully charged 4cell TP2100 and twisted the +/- wires together to see what would happen. It never blew. But just as dyrodium said, they are unpredictable. Sure they are safe for all intents and purposes, as long as you are always thinking about what you are doing with them (proper discharge and recharge rates). There have been too many fires to just ignore the warnings.

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