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11-20-2011, 10:13 PM | #1 |
I wanna be Dave Join Date: Mar 2008 Location: Wayne county. PA
Posts: 2,507
| soldering nimh batteries..........
should they be charged or discharged when soldering packs up, yeah i did a search and after reading 10 pages of hits for over 1 hours and still got no answer.........bob .... |
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11-20-2011, 10:53 PM | #2 |
Rock Crawler Join Date: May 2009 Location: Hillsboro, OR / Kapolei, Hi
Posts: 695
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Not sure. I've always just soldered them at whatever state/voltage they are at when they are shipped to me. Never had a problem. (don't know if this helped at all. sorry) -B |
11-20-2011, 11:05 PM | #3 |
I wanna be Dave Join Date: Mar 2008 Location: Wayne county. PA
Posts: 2,507
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did a voltage read on the one new cell i had not used and it was at 1.18 volts from over 3 years ago....so my guess it was at full charge....i had seven 8 cell packs i made for my crawler....i am using them up before i buy lipo's and have them all apart to make five 10 cell packs for my class 2 scaler for the 12 volts they will have with 10 cells which equal a 3s lipo....just wasn't sure if i need to fully charge them up before i go to town soldering.......bob .... |
11-21-2011, 12:25 AM | #4 |
Rock Crawler Join Date: May 2009 Location: Queensland, Australia
Posts: 610
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What 808 said is the same as me. For bash/practice race packs i never did anything, just soldered them up. For out and out race packs back in the day i used to Zap & match the cells (those were the days...lol) before i did it. |
11-21-2011, 08:35 AM | #5 |
RCC Addict Join Date: May 2008 Location: Chicago/Bloomington
Posts: 1,505
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The batteries don't care if they are charged or discharged when you solder the bars on. Just don't short them out while soldering. What you don't want to do is overheat them when you solder on the bars. |
11-21-2011, 09:33 AM | #6 |
I wanna be Dave Join Date: Mar 2008 Location: Wayne county. PA
Posts: 2,507
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yeah i know don't do both of those, i have a hakko 936 and can use high heat fast, thx all .........bob .... |
11-21-2011, 07:54 PM | #7 | |
I wanna be Dave Join Date: Jul 2005 Location: North Idaho
Posts: 3,647
| Quote:
The best bet is to cut one wire at a time, tin, and solder on the new connector with insolation, then do the other to prevent shorting the two. Even a discharged battery will produce one hell of an arc if you short the wires. | |
11-21-2011, 08:47 PM | #8 | |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
| Quote:
And yes, I used to pull packs apart a few times a season, test them, then reassemble "like" cells. Then again, we didn't have a lot of capacity so it was important to have them matched. | |
04-23-2013, 08:07 AM | #9 |
Newbie Join Date: Oct 2012 Location: Post Falls
Posts: 7
| Re: soldering nimh batteries..........
I know this is an old thread, but trying to build a couple batteries myself. I have six AAA nimh batteries at 1.2 volts a piece and they are each supposed to be 1800 mah. I have the pack done, and am getting a total of 7.53 volts, but only 245 mah when charged. Did I overheat them too much? or did I just start with crappy batteries from china? Not sure if resistance in my solder job could cause this. Would really appreciate any insight.
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