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Old 12-06-2003, 05:17 PM   #1
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Swollen lithium poly batteries

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Kokam 1200 and 1500mah lithium poly:
Has anyone experienced lithium poly batteries becoming swollen? During the charging of my 1200mah (2s) pack, I in error, charged it as three batteries. This lead to the battery becoming inflated. I can understand that what happened was my fault.
I also have a Kokam 1500mah (3s) pack where one of the three cells has also become inflated. This was not due to a charging error. Is this common for lithium poly batteries after say 10+ cycles? I'm still using the battery and it does not appeared to have suffered any performance problems, but I am concerned.

Anyone have a similar problem?
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Old 12-06-2003, 06:41 PM   #2
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I have not experienced this problem yet but from what I have read these cells are now toast.

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Old 12-07-2003, 09:30 AM   #3
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I have seriously been looking a Lithium batteries and, from what I have also read, I agree that these batteries are likely ruined.
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Old 12-07-2003, 11:38 AM   #4
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And from what I've read, if you did way over charge them like you say, your lucky they didn't catch fire. These batteries are very particular as to how they are to be charged and discharged and I would suggest that they never be left unattended while charging them for that reason.
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Old 12-08-2003, 07:20 AM   #5
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Yep , toast ! Lipoly's are great technology but it scares me that a lot of people are using them without being 100% familiar with the risks involved if they are not handled properly. There have been many instances of property loss due to Lipoly's combusting. There has been no loss of life but I think it's just a matter of time before somebody burns a house down !

Having said that , I am convinced that this is the future of electric flight and most of my aircraft will be flying with Lipoly's next year. I am fully aware of the risks and will try to be vigilant when I handle them but nobody's perfect . I suggest at least charging them away from anything flammable and never while in your aircraft. They should also not be left unattended while being charged. Ninety percent of all incidents have been because of overcharging ( too much voltage) . The rest have been due to faults in the pack or crash damage that has caused a short circuit.

Enjoy these new batteries but be careful !

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Old 12-09-2003, 08:44 PM   #6
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swollen lithium poly

Thanks for the input.
I know how I damaged my 2s 1200mah pack. It was during the charging process with my orbit charger. I had intended to "top up" the cells before a flight, so that when it was placed on the orbit charger, the charger determined that it was a 3s 1200mah pack and as such, charged it at the higher voltage. I had forgot to manually decrease the cell count. This caused the cells to inflate.
As for the 3s 1500mah pack, I have no idea how the one cell (one of three) became inflated. I have since removed it from the three cell configuration and I am using it as a 2s 1500mah pack.
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Old 12-19-2003, 12:28 AM   #7
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This one, charged as a NiCD on a triton, ruptured the professional-strength black quicktie that was holding it in the plane =>
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