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battery pack melted!!??!!??

Old 02-09-2004, 11:52 AM
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DaSHiKi
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Default battery pack melted!!??!!??

I was testing my radio equipment and I left it on my desk and walked inot the other room when I came back I smelled burning plastic and the plastic pack that holds the 4 aa batteries was melting it was plugged into the reciever and only had the sttering servo plugged in any ideas? its a traxxas rtr t-maxx radio
Old 02-09-2004, 12:28 PM
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MattLarson29
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Default RE: battery pack melted!!??!!??

Could you have had one of the batteries in backwards?

Matt
Old 02-09-2004, 06:37 PM
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wakbrdr
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Default RE: battery pack melted!!??!!??

something grounded out, make sure you have all the batteries in the right way, and make sure no bare wires are touching
Old 02-10-2004, 01:04 PM
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Default RE: battery pack melted!!??!!??

Yep.. Melting almost always means High currents

Voltage=Current X Resistance. (Ohms Law for DC Current)
6V = I X .05 Ohm (short out resistance)
I= 120A!!!!! Your batteries will only last a coupla seconds at this rate(if they can supply at this high a rate) but..enough to melt? Yea I think so

Ram
Old 02-10-2004, 01:07 PM
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Default RE: battery pack melted!!??!!??

AWESOME link I just found for many calculations regarding power:

http://www.ohiobelting.com/formulas.htm

Ram
Old 02-10-2004, 01:40 PM
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miserynitro
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Default RE: battery pack melted!!??!!??

True, but to melt a battery pack, the cell it self could have shorted out or too cause that much heat... must have shorted to a ground source ie Infinity on current spike until battery was shot.... and man those things can egt PRETTY hot in an instant... i tried charging some 2100 mah Ni-MH cells, and once current was placed on them, the temp shot right up to 75 degrees Celcuis.... in which my battery charger cut them off..... but i have seen things do some weirder stuff.
Old 02-10-2004, 01:44 PM
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Default RE: battery pack melted!!??!!??

Yeah good point..

What I didnt say was that the fast discharge probably caused the batteries to heat up.

But dude.. I'll never forget the time I had 2 NiCads in my pocket.. My KEYS shorted them out and cause a SERIOUS burn on my legs!!!
These batteries werent even really charged but later I found out that they were like 3000mA each !

ram
Old 02-10-2004, 02:45 PM
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Default RE: battery pack melted!!??!!??

OOCH!!! good thing they didn't get to close to the Boys if you know what i mean ... but sorry man, i can picture that in my head... and i probably would've laughed my face off
Old 02-10-2004, 07:07 PM
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Default RE: battery pack melted!!??!!??

lucky they did not catch on fire or exploded

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