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12-07-2004 03:40 AM  13 years agoPost 1
DaBman

rrApprentice

San Diego, Ca.

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Hey gang! I've been flying my Zoom with a TP 11.1V 2100Mah pack(among others) for awhile now with no problem. I just got back into town and took my chopper outside to fly, again flawless flight, and I noticed after the flight, during the battery change the pack was very puffy and had a liquidy feel to it. I know as well as you do this isn't desirable. This pack is not very old at all. I have my Phoenix 25 set at 9V cutoff and this is the first time it has happened. I've always floown this pack with 13- 16 min results and only just warm to the touch afterwards. What could have caused this sudden change in characteristics? Has my ESC gone bad?, and foremost, should I even try to recharge this pack(outside of course) or just take the loss? Any answers to the above questions would be of great help. Thanks!

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12-07-2004 03:49 AM  13 years agoPost 2
Saint728

rrProfessor

Honolulu, Hawaii

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That pack is dead. I would dispose of it fast before it catches on fire. Do not try to recharge the pack unless you video it and tape it blowing up, that would be kind of cool.

Take Care,
Cheers, Patirck

Check the hotties in my Gallery
http://rc.runryder.com/helicopter/gallery/9019/?all=photo

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12-07-2004 04:15 AM  13 years agoPost 3
t3k

rrApprentice

NJ, USA

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time for a bath in salt water

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12-07-2004 04:41 AM  13 years agoPost 4
DaBman

rrApprentice

San Diego, Ca.

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What, actually does te salt water do to nutralize the battery, and should I puncture the pack or just simply immerse the pack in salt water? What is the concentration of salt to water? I live by the beach so should I just throw it off of the pier(I wouldn't pollute in that manner) or is there some "brine recipe"? I'm going to contact TP first to see if they would inspect and?or replace the pack. Please advise.

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12-07-2004 06:47 AM  13 years agoPost 5
Rob_T

rrElite Veteran

..

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TP seem to have had some problems recently judging from the reports posted here. It also seems that they have been standing behind their products and replacing packs without problem.

TP say to discharge the pack to 3V per cell, put it in a bag (so it can't be shorted) and disposed of in the trash.

Kokham's US distributor (FMA) says discharge then "puncture plastic envelope, immerse in salt water for several hours, place in regular trash" .

I would modify FMA's directions to say puncture while under salt water. The idea of the salt water is to get a chemical reaction that uses up the lithium so it is no longer dangerous. I had one pack go with a flash and bang when I punctured it (I dont think it was completely flat and the knife probably also shorted the battery when I punctured it), so take care and definitely do it outside.

The amount of salt is as much as the water can dissolve- thats quite a lot!

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