SuperBrain 989 and NiMH  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> MRC Charger Product Support (i.e. Super Brain, etc) >> SuperBrain 989 and NiMH
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SuperBrain 989 and NiMH - 9/26/2007 4:16:17 AM   
Exidous


 

Posts: 2
Joined: 9/26/2007
From: , MN, USA
Status: offline 		I have about 4 4200 NiMH packs by integy, all of which I assembled myself. The cells say a 6amp charge and a 20 amp discharge. I have the Brain set to 6 and 10 because well 10 is the max on the brain. 3 out of the 4 packs now leak and hiss after only the second or third charge discharge cycle. It charges my 12v lead acid and my 2400 NiCD just fine. I know that you can dmg the cells during assembly if you over heat them but I made sure that the solder joints were done quickly and kept fairly cool. Is there anything that I'm missing and are my 3 packs pretty much fried?
       Post #: 1

RE: SuperBrain 989 and NiMH - 9/26/2007 9:34:07 PM   
guver


 

Posts: 8959
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		Hi, welcome to RCU. Probably the solder nor the charger is at fault and may be due to cells being imbalanced. If they've already vented or hissed then they are probably already hurt, but the correct thing to do is to do a c/10 charge for 15 hrs with a wall charger (one that doesn't turn off automatically) After that they can be charged at 6 amps and 5 mv per cell.

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(in reply to Exidous)
       Post #: 2

RE: SuperBrain 989 and NiMH - 9/30/2007 7:29:38 AM   
Exidous


 

Posts: 2
Joined: 9/26/2007
From: , MN, USA
Status: offline 		Ya I did a 420ma charge and let it charge for about 14hrs. let it sit for an hour then tried a discharge at a rate of 10amps. which is half what the battery is labled for and about about 2 min started to hiss. And a different cell than before :-(

(in reply to guver)
       Post #: 3

RE: SuperBrain 989 and NiMH - 9/30/2007 5:56:54 PM   
guver


 

Posts: 8959
Joined: 3/7/2003
From: LaGrange, OH, USA
Status: offline 		Hmm, sounds bad. Like there's at least 2 or more bad cells now.

_____________________________

you hear that silence?

(in reply to Exidous)
       Post #: 4

RE: SuperBrain 989 and NiMH - 10/1/2007 9:48:44 PM   
Tim@MRC


 

Posts: 356
Joined: 7/24/2006
From: Edison, NJ, USA
Status: offline 		Have you checked the voltage in each cell? Are yuo sure you have the cells arranged properly? Sometimes with new cells, if the voltage is really low, you may experience "cell reversal". If you try to charge with the cells in this condition, than you very well may damaged the cells. Try to get a voltage reading on each cell.

Tim

(in reply to guver)
       Post #: 5

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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> MRC Charger Product Support (i.e. Super Brain, etc) >> SuperBrain 989 and NiMH
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