Go Back   RCCrawler Forums > RCCrawler General Tech > Electronics
Loading

Notices

Thread: Finding bad battery cells in a battery pack.

Reply
 
LinkBack Thread Tools Display Modes
Old 02-03-2010, 08:08 PM   #1
Quarry Creeper
 
Join Date: Mar 2006
Location: Lutz
Posts: 457
Default Finding bad battery cells in a battery pack.

I really didnt know how to search for this but here goes. I have a couple of dead battery packs (an Elite 1500mah NIMH and an Elite 5000mah NIMH packs) and i was wondering how i could find out which cell are the bad cells? I would like to find the bad cells and replace them.
ToTheMAXXcrawler is offline   Reply With Quote
Sponsored Links
Old 02-03-2010, 08:13 PM   #2
RCC Addict
 
Join Date: Sep 2009
Location: Bradenton
Posts: 1,300
Default

thats a good ?i always threw mine away
chicostaxxs007 is offline   Reply With Quote
Old 02-03-2010, 08:57 PM   #3
Quarry Creeper
 
Join Date: Mar 2006
Location: Lutz
Posts: 457
Default

Yea i heard someone has done it here....i cant remember who...im sure there is a way to figure it out. I mean how to use a volt meter or something to find the bad cells.
ToTheMAXXcrawler is offline   Reply With Quote
Old 02-03-2010, 09:44 PM   #4
I wanna be Dave
 
Join Date: Oct 2006
Location: Centered
Posts: 2,082
Default

Remove the heat shrink and test each cell with a volt/multi meter...you should have enough room to get the meter pins between each cell.
CreepyCrawl is offline   Reply With Quote
Old 02-03-2010, 09:50 PM   #5
RcBros Hobbies
 
RcBro's Avatar
 
Join Date: Nov 2005
Location: Oregon
Posts: 4,646
Default

Quote:
Originally Posted by CreepyCrawl View Post
Remove the heat shrink and test each cell with a volt/multi meter...you should have enough room to get the meter pins between each cell.
+1
RcBro is offline   Reply With Quote
Old 02-03-2010, 09:52 PM   #6
I wanna be Dave
 
Join Date: Jan 2006
Location: ...the burning end of the rope.
Posts: 5,013
Default

place the positive lead (red)on the pos end of each cell and negative lead (black) to the neg end. a bad cell will be out of the range of the good cells,,,example 1.2--1.4---1.23----0.93< bad cell---1.1---1.6

the bad cell or cells will be different from the good ones,,usually with lesser voltage showing,,you can also make a load lead with a tail light bulb from a 1:1 car ie: 1157 bulb which you put in line between the meter lead and one side of the battery cells,,this will be a little more accurate if you dont find something pretty easy the other way
rmdesignworks is offline   Reply With Quote
Old 02-04-2010, 03:25 AM   #7
Quarry Creeper
 
Join Date: Jan 2010
Location: USA
Posts: 402
Default

Also, if you use your battery pack and one cell becomes much hotter than the rest (in temperature), that would be your bad cell. This happened to me in the past. To replace a cell, you would need to find one with the same capacity as the rest of the pack. I didn't have one, so I turned a 7 cell into a 6 cell (not ideal, but usable).
wantAsummit is offline   Reply With Quote
Old 02-04-2010, 06:50 AM   #8
Quarry Creeper
 
Join Date: Mar 2006
Location: Lutz
Posts: 457
Default

That's the answer I was looking for. What setting do I put the voltmeter on?
ToTheMAXXcrawler is offline   Reply With Quote
Old 02-04-2010, 07:52 AM   #9
Quarry Creeper
 
Join Date: Jan 2010
Location: USA
Posts: 402
Default

Your voltmeter should be set to DC Volts. If you voltmeter does not have auto-ranging, then set it for the lowest setting at or above 2 volts. Look for the one cell that is different than the others.
wantAsummit is offline   Reply With Quote
Old 02-04-2010, 10:14 AM   #10
Quarry Creeper
 
Join Date: Mar 2006
Location: Lutz
Posts: 457
Default

Sweet thanks a bunch for all the info!
ToTheMAXXcrawler is offline   Reply With Quote
Reply



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 01:36 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO ©2011, Crawlability, Inc.
Copyright 2004-2014 RCCrawler.com