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Old 10-30-2011, 02:12 AM   #1
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Default CROSSED LIPO WIRES! Help!

So I was rushing to make it for my qualifier tonight and I accidentlly crossed my positive and negative wires when I put my lipo in my truck. I plugged it into the esc not realizing they were crossed, and it made a spark but no smoke. I immediately tried to turn on my esc but it didn't work. Is my battery dead forever?? Thanks
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Old 10-30-2011, 02:14 AM   #2
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try another battery, chances are you cooked th esc unless it was a cheap lipo, sometimes they unsolder thmselves inside saving the esc at the cost of the pack.
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Old 10-30-2011, 02:18 AM   #3
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Originally Posted by rcjunky1 View Post
try another battery, chances are you cooked th esc unless it was a cheap lipo, sometimes they unsolder thmselves inside saving the esc at the cost of the pack.
All of the electronics are fine, i put another battery in and it worked perfect. It's a gens ace 5000 40c. Could I open up the battery and resolder if that is the problem?
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Old 10-30-2011, 07:18 AM   #4
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maybe, the tabs they are soldered on are very thin and they use a solder with a high melting tem so you might be able to reflow the solder, put the case back together and it will be fine. Theres no hard in trying as long as you are carefull, URC on youtube did a video on taking apart a hardcase, he actually did it on the same pack you have.
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Old 10-30-2011, 09:13 AM   #5
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If its a Gens Ace hardcase lipo, the solder joint inside melted open. Did this to mine before as well. The little circuit board that the socket tubes are soldered to have one of the traces cut and a mound of solder bridged across the cut, acting like a fuse. That solder bridge was melted open when you plugged the wires in backwards. You'll have to, carefully, pry/cut the hardcase open and resolder the bridge.

Before your next race day, shorten up your plug wires so that at least one of the plugs can't possibly reach far enough to be plugged into the wrong socket on the battery. That's the only sure fire way of idiot proofing your setup. A better way is to use Castle bullet connectors into the battery, wired to Deans plugs, and never removed the bullet connectors from the battery. Constantly plugging and unplugging bullet connectors from the battery wears out the bullet connectors and socket tubes in the battery, causing poor connections, heat, and melted solder joints.
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Old 10-30-2011, 09:50 AM   #6
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Did the same thing myself with the same pack. It was the solder trace to the bullet socket. It took longer to open the case than it took to repair. You have to be carefull when opening the case so you dont cut into the cells. I used the back edge of a # 11 blade to more less scrape the joint open rather than cut it.
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Old 10-30-2011, 12:43 PM   #7
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Thanks for all of the responses! I think I'm going to try an repair it and hopefully I won't cut one of the cells when trying to open the case. I know there only $35 but if I can repair it, why not?
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Old 10-30-2011, 01:06 PM   #8
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i've fixed jm gens ace pack that's exactly what happened to you.
a voltmeter would help you locate where need to be solder.
what i did is use a hobby knife to cut open the side then pry open the case by flat head screwdriver before i cut too deep
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