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06-05-2006, 10:11 PM
| #1 |
| Pebble Pounder Join Date: May 2006 Location: Scottsdale
Posts: 180
|  Determining bad cells
I have a United Rc Sport 71 8.4v 1100mah 7 cell NiMH for my and it no longer is in working order. All the cells appear to be alright as well as all the solders, but I am sure there is just one bad one in there. How would I find out which one to pull?
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06-05-2006, 10:28 PM
| #2 |
| owner, Holmes Hobbies LLC   Join Date: Nov 2004 Location: Volt up! Gear down!
Posts: 20,290
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fully charge it slowly, then let is sit for one day. Take a voltmeter to each cell. This requires taking apart the pack. They should each be above 1.2 volts, probably around 1.3 or more. Any cell that is below 1.2 volts is bad. Be very careful!! If you short a cell you can cause fire, smoke, and other dangerous conditions. If you dont know what you are doing then dont do it. |
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06-06-2006, 12:06 AM
| #3 |
| Pebble Pounder Join Date: May 2006 Location: Scottsdale
Posts: 180
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yeah I would say I don't really know what Im doing. I mean I don't have a voltmeter. But I can't even do that because when I plug the pack in to charge it makes a loooow pitch beeping noise.
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06-06-2006, 08:52 AM
| #4 |
| Quarry Creeper Join Date: Nov 2004 Location: MANVILLE
Posts: 413
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while you are charging it,check to see if 1 cell is getting warmer or hotter then the others,if so then thats a bad one
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06-06-2006, 09:23 AM
| #5 | |
| Diggin' the new SCX10 II!  Join Date: Mar 2004 Location: Norcal
Posts: 11,402
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06-06-2006, 04:24 PM
| #6 | |
| Pebble Pounder Join Date: May 2006 Location: Scottsdale
Posts: 180
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06-06-2006, 07:47 PM
| #7 | |
| Pebble Pounder Join Date: Jul 2005 Location: Greece
Posts: 154
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06-06-2006, 08:00 PM
| #8 | |
| Quarry Creeper Join Date: Jun 2005 Location: in the middle of the pacific ocean
Posts: 455
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 you should get a cheap meter, that is the easiest way to tell the conditions of your battery packs/cells  | |
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