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Old Jun 28, 2004, 10:35 PM
MailOrderGuy is offline
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Lipo question, I have never seen this before


I just purchased a TP 3S1P 1300 2nd Gen pack. I inspected the pack before soldering or charging it and noticed something odd.

The two outside cells look fine, the middle cell is concerning me.
There seems to be "water" (or some kind of liquid) trapped between the foil cell and what appears to be a clear wrapper on the middle cell.

The first picture shows the pack laying flat, look at the middle cell, you can see the trapped liquid with air bubbles on each side of it.

The next picture, I stood the pack on end and you can see the air bubbles moved to the top of the cell and the trapped liquid went to the bottom.

Can I use this pack?
Does anyone know what was going on here?
Do I have a ruptured cell here?
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Old Jun 28, 2004, 10:47 PM
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I wouldn't use it! Does it have a sweet odor? If it does, it is probably electrolyte from the cell and that is bad news. You could measure each cells voltage and do some charge/discharge tests (if all the voltages were equal) but I wouldn't touch it till I talked to TP. If it were mine I would get a replacement.

hoppy
Old Jun 28, 2004, 10:50 PM
Dave Hederich is offline
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How many times have we heard "I have never seen this before" in relation to Li-poly cells?
Old Jun 28, 2004, 11:39 PM
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I sniffed the pack, if there is a sweet smell, its faint. Kinda smells sweetly fresh, its not a real strong odor.
I put the voltage tester to it, the pack reads 11.45V.

I wonder if this could be a cooling substance from Thunder Power.

I will see if Mr. Wang will take a look at this thread.
Old Jun 29, 2004, 12:50 AM
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Quote:
Originally Posted by MailOrderGuy
I sniffed the pack, if there is a sweet smell, its faint. Kinda smells sweetly fresh, its not a real strong odor.
I put the voltage tester to it, the pack reads 11.45V.

I wonder if this could be a cooling substance from Thunder Power.

I will see if Mr. Wang will take a look at this thread.
Sweet smell= big trouble. Return to vendor for replacement!

Steve
Old Jun 29, 2004, 02:18 AM
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I don't necessarily think it is bad. All packs have a slight smell to them. A failed one that is leaking electrolyte will have a fairly strong sweet smell.

-- Gary

www.tppacks.com
Old Jun 29, 2004, 02:43 AM
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Quote:
Originally Posted by GGoodrum
I don't necessarily think it is bad. All packs have a slight smell to them. A failed one that is leaking electrolyte will have a fairly strong sweet smell.

-- Gary

www.tppacks.com
Not in my book--sealed cells should not have any noticable smell! Any smell means that air can enter and be a possible fire cause.

Steve
Old Jun 29, 2004, 09:17 AM
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Quote:
Originally Posted by GGoodrum
I don't necessarily think it is bad. All packs have a slight smell to them. A failed one that is leaking electrolyte will have a fairly strong sweet smell.

-- Gary

www.tppacks.com
Gary, do you have any thoughts on what that liquid is? Have you seen this liquid before?

Without knowing what it is and how it got there, I would be concerned as to: what effect will it have on cell life? and what effect will it have on pack safety? I'd be concerned enough to send it back. Wouldn't you agree it is outside the limits of normal cell appearance?
Old Jun 29, 2004, 11:44 AM
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I must say I have not seen this. I would definitely send it in for replacement.

Steve, I agree that a pack that leaks is dangerous. My point is that a good pack has a very slight smell, probably either the tape used or the shrink wrap, that some people have confused as being the same as a pack that has failed. That smell is a very strong, unmistakeable sweet smell.

-- Gary
Old Jun 29, 2004, 12:22 PM
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Thanks to all who responded, this ones going back to the vendor.

Now that I think of it, I ordered two of these in the same shipment, the other 3S1P 1300 pack arrived with both of the outside cells puffed. This pack (pictured above) was also in the order, hmmmm..... they both must have suffered damage during shipment.

I have often thought that vendors should take specail care in packing Lipo's for shipment. Should these batteries be shipped with a Haz-Mat label?
Old Jun 29, 2004, 09:19 PM
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Let us know what the manufacturer tells you.
hoppy


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