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Rejuvenating Ni-MH battery

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chasb(at)satx.rr.com
Guest

Posted: Wed Dec 05, 2012 8:31 pm Post subject: Rejuvenating Ni-MH battery

Bob, et. al.,



I recall this was a thread awhile back, but I could not find my answer  

in the archives.



Basically I have a 9.6v, 760mAh, Ni-MH battery pack (BP-200L) for an  

ICOM handheld radio. The battery will no longer take a charge. Is  

there any way to rejuvenate the battery? I emailed the question to the  

ICOM Technical Service department, but they never bothered to respond.



One of the AeroElectric archive suggestions was to discharge a Ni-MH  

battery with a dead short for 24 hours, then apply a 1 amp, 3v charge  

for a few seconds, then recharge normally. However, I think this  

recommendation must have been for a smaller battery, maybe a 1.5v  

cell. Is there a recommended flash voltage and amperage to try and  

rejuvenate my 9.6v battery?



Charlie Brame

RV-6A  N11CB

San Antonio

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john.maccallum(at)bigpond
Guest

Posted: Thu Dec 06, 2012 12:08 am Post subject: Rejuvenating Ni-MH battery

There are battery rejuvenating chargers around but I have had little success

with them in commercial use.

I just go out and buy a new battery when they start to play up.

Cheers



John MacCallum

VH-DUU

RV 10 # 41016

--

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu Dec 06, 2012 8:30 am Post subject: Rejuvenating Ni-MH battery

At 10:30 PM 12/5/2012, you wrote:

 	  Quote: 	
		  



Bob, et. al.,



I recall this was a thread awhile back, but I could not find my answer

in the archives.



Basically I have a 9.6v, 760mAh, Ni-MH battery pack (BP-200L) for an

ICOM handheld radio. The battery will no longer take a charge. Is

there any way to rejuvenate the battery? I emailed the question to the

ICOM Technical Service department, but they never bothered to respond.


	


   Have you looked to see what's involved in getting

   the battery box open? There are companies that

   specialize in cell replacement for a constellation

   of products.



   I've kept an inventory of AAA, AA and 2/3C NiMh cells

   with solder tabs on hand to re-cell many of my own

   tools. Just replaced all the cells in my wireless

   phone handsets for a fraction of the cost of manufactured

   cell assemblies.



   As others have noted, rejuvenating the stagnant

   cad cell is problematic. You $time$ fiddling with

   a junk cell can easily cost you more than a new cell.



   The last time I used rechargeable cells in my

   camera equipment, I used a magic marker to denote

   the number of recharge cycles on each cell in my

   inventory. I pitched the cells after a dozen or so

   cycles. An imbalance of cell capacity sets up

   a scenario where one soggy cell in an array of four can

   cause a device to quit in spite of the fact that

   the other cells are in great shape. The $time$ it

   takes to cap-check cells and mate them with cells

   of similar capacity was simply not a good use

   of $time$.  I could buy an AA NiMh battery for

   about the same cost as a premium AA alkaline.

   Ten cycles through the charger reduces my

   battery costs by 90% while scheduled 'retirement'

   maintained overall system reliability without

   incurring preventative maintenance expenses.

   Bob . . .

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