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Old 11-16-2008, 06:14 PM   #1
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Default Do you think this Lipo is safe to use?

I had a rear dogbone pop out on my 8ight-E while running today, and it slapped the battery a little. It cut through the plastic outer wrap and the silver cell wrap underneath, exposing a black area that looks similar to carbon fiber.

The battery continued to run (I didn't notice the damage until I got it off the track) but I haven't tried to charge it yet. Picture is attached.. does anyone know the makeup of a cell that can say how deep this is? If I rewrapped the pack would it be fine?

The fact that it didn't swell or stop working tells me that no damage was done yet, but I don't want to push it.
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Do you think this Lipo is safe to use?-lipo.jpg  
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Old 11-16-2008, 06:23 PM   #2
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I don't think i would, might be a risk of a short or worse. AzRon
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Old 11-16-2008, 06:45 PM   #3
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Yeah I'm with AzRon, it's a no go for the lipo

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Old 11-16-2008, 06:54 PM   #4
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I don't think you got into the lipo itself - otherwise there would have been a serious venting of smoke and that cell would have consumed itself. I punctured a lipo with a stick accidently and it let off a ton of very dense white smoke and destroyed that cell - what was left looked like a burnt deck of cards that was glued together on one end. If vented to atmosphere, lipo oxidizes at a pretty high rate, no visible fire, but heat and lots of cottonball smoke!

Use something to completely seal the hole, something flexible, like shoe goo and give it time to dry. I'd charge it outside the 1st time and watch. If it doesn't do anything funny, you got lucky. If it puffs or doesn't come up to right voltage, I'd replace it to be safe. You might try to salvage the remaining good cell.

I'd work on a guard or something like that so this can't happen again.
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Old 11-16-2008, 07:55 PM   #5
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Gotta love soft pack lipos, from my experience you have a plastic cover under that is a silver foil like substance and then the cell itself. By the sounds of things you have reached the cell but were lucky enough not to puncture it! I really wouldnt mess with it, throw it away and get a hard case lipo. You can also purchase cases for lipos which would make it even safer. I have seen a few of these go up and they pretty much nuke anything near to them. I had a friend that lost his chassis/esc/shell and of course the lipo when it went up..Pretty expensive exercise
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Old 11-16-2008, 09:02 PM   #6
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were do you buy cases for lipo's?? i never seen them before?..i agree with the rest if the aluminum wrap is punctured its probably not realy safe,but not garbage...you can give it a try to fix it..if it did vent you would have smelled it..that stuff stinks when its punctured!and it looks like gel...dont ask me how i know..its just a little scary when the protective wrap has been jeopardized
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Old 11-16-2008, 09:04 PM   #7
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Yeah that's my concern.. I have a lipo sack for charging but if it decides to go ballistic while it's in the buggy it's not going to be good.
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Old 11-16-2008, 09:08 PM   #8
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Quote:
Originally Posted by Miller_Time View Post
Yeah that's my concern.. I have a lipo sack for charging but if it decides to go ballistic while it's in the buggy it's not going to be good.
not sure i would take a chance on that battery.. i would probably just dispose of it properly and buy a new one...
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Old 11-16-2008, 09:56 PM   #9
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Is it possible to contact the company and see if they can repair the wrap/cell?
Might be cheaper that way? I'm sure those big 1/8 LiPo's aren't cheap.

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Old 11-16-2008, 10:12 PM   #10
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Common sense says replace it.

My cheap-ass sense says lets see if it still works....
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Old 11-16-2008, 10:48 PM   #11
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were do you buy cases for lipo's?? i never seen them before?..
I have seen them for the 2s dunno bout the 3s ones though. I will have a look around an get back to you It doesnt make the soft pack lipos a hard case it is just a plastic cover that would prevent annoying incidents like these
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Old 11-16-2008, 10:49 PM   #12
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Quote:
Originally Posted by pyro18t View Post
Is it possible to contact the company and see if they can repair the wrap/cell?
Might be cheaper that way? I'm sure those big 1/8 LiPo's aren't cheap.

Jay
Im sure its cheaper than replacing the chassis/esc/receiver and battery if it goes up. Being cheap can sometimes end up costing more. The fact that you came on here to ask other people if they think the battery is ok already tells you that its not worth the risk.

http://www.rcstuff.us/battery/lipo/lipo_DNA.html

have a look at that before you throw that lipo back on your charger with shoe goo over the hole.
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Old 11-16-2008, 11:17 PM   #13
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Originally Posted by CMB21 View Post
Im sure its cheaper than replacing the chassis/esc/receiver and battery if it goes up. Being cheap can sometimes end up costing more. The fact that you came on here to ask other people if they think the battery is ok already tells you that its not worth the risk.

http://www.rcstuff.us/battery/lipo/lipo_DNA.html

have a look at that before you throw that lipo back on your charger with shoe goo over the hole.
By no means was I telling him to run an unsafe battery. But I think if the manufacturer takes a look at the battery, deems it safe and rewraps the battery he might spend $20 opposed to $200 for a new pack. That is, if they will even look at it

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Old 11-17-2008, 12:36 AM   #14
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lol you took that the wrong way, i meant the next bit about 1/8th lipo's not being cheap

If manufacturer says its ok then im sure there wouldnt be a problem. Was just giving my 2c not having a go at you.
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Old 11-17-2008, 12:52 AM   #15
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lol you took that the wrong way, i meant the next bit about 1/8th lipo's not being cheap

If manufacturer says its ok then im sure there wouldnt be a problem. Was just giving my 2c not having a go at you.

Oh...uh... yeah I knew that LOL

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